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Stockholders' Equity - Summary of Restricted Stock, Restricted Stock Unit and Performance-based Stock Unit Activity (Parenthetical) (Detail) - Performance-Based Stock Units [Member]
6 Months Ended
Jun. 30, 2016
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance-based stock units, percentage of attainment level 100.00%
Class A Common Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance-based stock units 43