101 - Document - Document and Entity Information
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103 - Statement - Condensed Consolidated Balance Sheets
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104 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)
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105 - Statement - Condensed Consolidated Statements of Operations
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106 - Statement - Condensed Consolidated Statements of Operations (Parenthetical)
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107 - Statement - Condensed Consolidated Statements of Cash Flows
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108 - Disclosure - Basis of Presentation and Principles of Consolidation
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109 - Disclosure - Revenue Recognition
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110 - Disclosure - Declaration of Dividend Payable
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111 - Disclosure - Earnings Per Common Share
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112 - Disclosure - Stock-Based Compensation
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113 - Disclosure - Fair Value of Financial Instruments
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114 - Disclosure - Stock Repurchases
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115 - Disclosure - Comprehensive Income
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116 - Disclosure - Industry Segments
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117 - Disclosure - Contingencies
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118 - Disclosure - Subsequent Event
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119 - Disclosure - Basis of Presentation and Principles of Consolidation (Policies)
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120 - Disclosure - Earnings Per Common Share (Tables)
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121 - Disclosure - Fair Value of Financial Instruments (Tables)
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122 - Disclosure - Industry Segments (Tables)
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123 - Disclosure - Revenue Recognition - Additional Information (Detail)
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124 - Disclosure - Declaration of Dividend Payable - Additional Information (Detail)
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125 - Disclosure - Earnings Per Common Share - Additional Information (Detail)
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126 - Disclosure - Basic Earnings Per Common Share (Detail)
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127 - Disclosure - Diluted Earnings Per Share for Class A Common Shares Using If-Converted Method (Detail)
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128 - Disclosure - Diluted Earnings Per Share for Class B Common Shares Using Two-Class Method (Detail)
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129 - Disclosure - Stock-Based Compensation - Additional Information (Detail)
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130 - Disclosure - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail)
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131 - Disclosure - Stock Repurchases - Additional Information (Detail)
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132 - Disclosure - Industry Segments - Additional Information (Detail)
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133 - Disclosure - Segment Information (Detail)
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134 - Disclosure - Subsequent Event - Additional Information (Detail)
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