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Summary of Equity-Based Compensation Activity (Detail)
6 Months Ended
Jun. 30, 2014
Restricted Stock Units (RSUs)
 
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Balance as of January 1, 2014 241,854
Granted   
Exercised   
Forfeited (9,550)
Delivered and exchanged for shares of Class A common stock (77,452)
Cancelled (30,519)
Balance as of June 30, 2014 124,333
Unvested 124,333
Stock options
 
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Balance as of January 1, 2014 787,500
Options granted   
Exercised   
Balance as of June 30, 2014 787,500
Vested 787,500