Equity - Schedule of Movement in Outstanding Shares of Class A Common Stock, Restricted Class A Common Stock and Deferred Stock Units (Detail) - shares	1 Months Ended	3 Months Ended
	May 31, 2013	Mar. 31, 2017	Mar. 31, 2016
Equity [Abstract]
Beginning balance		94,709,290	93,843,847
Issuance of class A common stock	25,875,000	270	285
Issuance of restricted class A common stock, net		277,815	209,798
Issuance of deferred stock units		6,415	7,322
Ending balance		94,993,790	94,061,252