101 - Document - Document and Entity Information
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103 - Statement - Consolidated Balance Sheets
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104 - Statement - Consolidated Balance Sheets (Parenthetical)
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105 - Statement - Consolidated Statements of Operations
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106 - Statement - Consolidated Statements of Comprehensive Income (Loss)
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107 - Statement - Consolidated Statements of Changes in Stockholders' Equity (Deficit)
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108 - Statement - Consolidated Statements of Changes in Stockholders' Equity (Deficit) (Parenthetical)
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109 - Statement - Consolidated Statements of Cash Flows
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110 - Statement - Consolidated Statements of Cash Flows (Parenthetical)
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111 - Disclosure - Organization and Significant Accounting Policies
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112 - Disclosure - Acquisitions
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113 - Disclosure - Prepaid Expenses and Other Current Assets
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114 - Disclosure - Fixed Assets
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115 - Disclosure - Goodwill and Intangible Assets
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116 - Disclosure - Accounts Payable and Accrued Expenses
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117 - Disclosure - Other Current Liabilities
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118 - Disclosure - Other Long-Term Liabilities
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119 - Disclosure - Credit Arrangements and Debt Obligations
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120 - Disclosure - Redeemable Non-Controlling Interest
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121 - Disclosure - Income Taxes
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122 - Disclosure - Stockholders' Equity and Stock-Based Compensation
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123 - Disclosure - Earnings Per Share
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124 - Disclosure - Commitments and Contingencies
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125 - Disclosure - Employee Benefit Plans
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126 - Disclosure - Segment and Geographic Information
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127 - Disclosure - Transactions with Related Parties
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128 - Disclosure - Quarterly Results (Unaudited)
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129 - Disclosure - Organization and Significant Accounting Policies (Policies)
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130 - Disclosure - Organization and Significant Accounting Policies (Tables)
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131 - Disclosure - Acquisitions (Tables)
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132 - Disclosure - Prepaid Expenses and Other Current Assets (Tables)
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133 - Disclosure - Fixed Assets (Tables)
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134 - Disclosure - Goodwill and Intangible Assets (Tables)
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135 - Disclosure - Accounts Payable and Accrued Expenses (Tables)
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136 - Disclosure - Other Current Liabilities (Tables)
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137 - Disclosure - Other Long-Term Liabilities (Tables)
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138 - Disclosure - Credit Arrangements and Debt Obligations (Tables)
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139 - Disclosure - Redeemable Non-Controlling Interest (Tables)
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140 - Disclosure - Income Taxes (Tables)
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141 - Disclosure - Stockholders' Equity and Stock-Based Compensation (Tables)
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142 - Disclosure - Earnings Per Share (Tables)
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143 - Disclosure - Commitments and Contingencies (Tables)
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144 - Disclosure - Segment and Geographic Information (Tables)
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145 - Disclosure - Quarterly Results (Unaudited) (Tables)
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146 - Disclosure - Organization and Significant Accounting Policies - Additional Information (Detail)
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147 - Disclosure - Organization and Significant Accounting Policies - Activity in Allowance for Doubtful Accounts (Detail)
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148 - Disclosure - Acquisitions - Additional Information (Detail)
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149 - Disclosure - Acquisitions - Allocation of Purchase Price (Detail)
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150 - Disclosure - Acquisitions - Summary of Operating Results (Detail)
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151 - Disclosure - Acquisitions - 2012 Acquisitions - Additional Information (Detail)
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152 - Disclosure - Acquisitions - 2011 Acquisitions - Additional Information (Detail)
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153 - Disclosure - Acquisitions - Fair Value of Assets Acquired (Detail)
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154 - Disclosure - Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail)
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155 - Disclosure - Fixed Assets - Summary of Fixed Assets (Detail)
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156 - Disclosure - Fixed Assets - Additional Information (Detail)
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157 - Disclosure - Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Detail)
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158 - Disclosure - Goodwill and Intangible Assets - Intangible Assets Subject to Amortization (Detail)
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159 - Disclosure - Goodwill and Intangible Assets - Additional Information (Detail)
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160 - Disclosure - Goodwill and Intangible Assets - Estimated Amortization Expense Related to Intangible Assets (Detail)
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161 - Disclosure - Accounts Payable and Accrued Expenses - Summary of Accounts Payable and Accrued Expenses (Detail)
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162 - Disclosure - Other Current Liabilities - Summary of Other Current Liabilities (Detail)
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163 - Disclosure - Other Long-Term Liabilities - Summary of Other Long-Term Liabilities (Detail)
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164 - Disclosure - Credit Arrangements and Debt Obligations - Schedule of Long-Term Debt (Detail)
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165 - Disclosure - Credit Arrangements and Debt Obligations - Additional Information (Detail)
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166 - Disclosure - Redeemable Noncontrolling Interest - Additional Information (Detail)
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167 - Disclosure - Redeemable Non-controlling Interest - Changes in Redeemable Non-controlling Interest (Detail)
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168 - Disclosure - Redeemable Non-controlling Interest - Changes in Redeemable Non-controlling Interest (Parenthetical) (Detail)
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169 - Disclosure - Income Taxes - Income (Loss) Before Income Taxes (Detail)
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170 - Disclosure - Income Taxes - Income Tax (Benefit) Expense (Detail)
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171 - Disclosure - Income Taxes - Reconciliation of Federal Statutory Rate to Effective Rate (Detail)
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172 - Disclosure - Income Taxes - Components of Net Deferred Tax Liability (Detail)
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173 - Disclosure - Income Taxes - Additional Information (Detail)
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174 - Disclosure - Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail)
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175 - Disclosure - Stockholder's Equity and Stock-Based Compensation - Additional Information (Detail)
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176 - Disclosure - Stockholders' Equity and Stock-Based Compensation - Reconciliation of Changes in Class L Common Stock (Detail)
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177 - Disclosure - Stockholders' Equity and Stock-Based Compensation - Stock Option Activity (Detail)
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178 - Disclosure - Stockholders' Equity and Stock-Based Compensation - Stock Option Activity (Parenthetical) (Detail)
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179 - Disclosure - Stockholders' Equity and Stock-Based Compensation - Weighted Average Assumptions for Fair Value of Stock Option (Detail)
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180 - Disclosure - Stockholders' Equity and Stock-Based Compensation - Stock Option Activity Under Equity Plan (Detail)
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181 - Disclosure - Earnings Per Share - Computation of Basic and Diluted Earnings Per Common Share (Detail)
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182 - Disclosure - Earnings Per Share - Additional Information (Detail)
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183 - Disclosure - Commitments and Contingencies - Additional Information (Detail)
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184 - Disclosure - Commitments and Contingencies - Future Minimum Payments under Non-Cancelable Operating Leases (Detail)
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185 - Disclosure - Commitments and Contingencies - Future Minimum Payments of Long-term Debt (Detail)
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186 - Disclosure - Employee Benefit Plans - Additional Information (Detail)
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187 - Disclosure - Segment and Geographic Information - Income from Operations by Segment (Detail)
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188 - Disclosure - Segment and Geographic Information - Income from Operations by Segment (Parenthetical) (Detail)
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189 - Disclosure - Segment and Geographic Information - Revenue and Long-Lived Assets by Geographic Region (Detail)
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190 - Disclosure - Segment and Geographic Information - Additional Information (Detail)
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191 - Disclosure - Transactions with Related Parties - Additional Information (Detail)
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192 - Disclosure - Quarterly Results (Unaudited) - Schedule of Quarterly Financial Information (Detail)
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193 - Disclosure - Quarterly Results (Unaudited) - Schedule of Quarterly Financial Information (Parenthetical) (Detail)
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