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	6 Months Ended
	May 31, 2013	Jun. 30, 2016	Jun. 30, 2015
Class of Stock [Line Items]
Beginning balance		93,843,847	58,388,808
Issuance of class A common stock	25,875,000	550	34,780,298
Issuance of restricted class A common stock, net		209,798	179,799
Issuance of deferred stock units		14,155	10,665
Ending balance		94,068,350	93,359,570