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Stock-Based Incentive Plans - Movement in Outstanding Shares of Restricted Class A Common Stock and Weighted-Average Grant Date Fair Value Per Share (Detail) - Restricted Class A Common Stock [Member]
9 Months Ended
Sep. 30, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted Class A Common Stock, Beginning Balance | shares 1,114,908
Restricted Class A Common Stock, Granted | shares 245,225
Restricted Class A Common Stock, Vested | shares (513,849)
Restricted Class A Common Stock, Forfeited | shares (35,427)
Restricted Class A Common Stock, Ending Balance | shares 810,857
Weighted-Average Grant Date Fair Value Per Share, Beginning Balance | $ / shares $ 27.64
Weighted-Average Grant Date Fair Value Per Share, Granted | $ / shares 26.51
Weighted-Average Grant Date Fair Value Per Share, Vested | $ / shares 27.10
Weighted-Average Grant Date Fair Value Per Share, Forfeited | $ / shares 27.49
Weighted-Average Grant Date Fair Value Per Share, Ending Balance | $ / shares $ 27.64