Earnings Per Share and Dividends - Additional Information (Detail) (USD $)	3 Months Ended		0 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	May 08, 2014 Subsequent Event
Dividends Payable [Line Items]
Distributions declared per Class A common stock	$ 0.0625	$ 0	$ 0.0625
Distributions declared per Class A common stock, payable date			Jun. 05, 2014
Distributions declared per Class A common stock, record date			May 22, 2014