Equity - Schedule of Movement in Outstanding Shares of Class A Common Stock, Restricted Class A Common Stock and Deferred Stock Units (Detail) - Class A Common Stock [Member] - shares	1 Months Ended	3 Months Ended
	May. 31, 2013	Mar. 31, 2016	Mar. 31, 2015
Class of Stock [Line Items]
Beginning balance		93,843,847	58,388,808
Issuance of class A common stock	25,875,000	285	139
Issuance of restricted class A common stock, net		209,798	181,049
Issuance of deferred stock units		7,322	5,414
Ending balance		94,061,252	58,575,410