Equity-Based Compensation - Activity related to DSUs (Detail) - Non-Management Director Compensation Plan (the Director Plan) - Deferred Stock Units - $ / 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)	33,750	90,000	90,000
Number of Shares, Activity for the three months ended March 31, 2016 (in shares)		0
Number of Shares, Vested (in shares)	(5,625)
Number of Shares, Issued and unvested as of end of period (in shares)	28,125	90,000	33,750
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)	$ 13.17	$ 13.17	$ 13.17
Weighted Average Grant Date Fair Value, Activity for the three months ended March 31, 2016 (in dollars per share)		0.00
Weighted Average Grant Date Fair Value, Vested (in dollars per share)	13.17
Weighted Average Grant Date Fair Value, Issued and unvested as of end of period (in dollars per share)	$ 13.17	$ 13.17	$ 13.17