Equity-Based Compensation - Share Activity with Respect to Restricted Stock (Detail) - Restricted stock - $ / shares	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of Shares, Issued and unvested as of beginning of period (in shares)	2,644,030	3,480,828	3,480,828
Number of Shares, Granted (in shares)	286,256	434,283
Number of Shares, Vested (in shares)	(625,646)	(657,317)
Number of Shares, Forfeited (in shares)	(167,712)	(588,819)
Number of Shares, Issued and unvested as of end of period (in shares)	2,136,928	2,668,975	2,644,030
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Grant Date Fair Value, Issued and unvested as of beginning of period (in dollars per share)	$ 14.15	$ 16.51	$ 16.51
Weighted Average Grant Date Fair Value, Granted (in dollars per share)	13.85	8.44
Weighted Average Grant Date Fair Value, Vested (in dollars per share)	15.30	18.75
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share)	8.44	10.69
Weighted Average Grant Date Fair Value, Issued and unvested as of end of period (in dollars per share)	$ 14.22	$ 15.93	$ 14.15