Stock-Based Incentive Plans - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2013 Plans	Dec. 31, 2012	Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Number of benefit plans	5
Issuance of restricted class A common stock, net	700,000	36,493	26,161
Restricted Stock [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Issuance of restricted class A common stock, net	700,000
Restricted shares, vesting period	3 years
2013 Plan [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Maximum number of shares available under plan	1,450,224
2013 Manager Plan [Member] | Maximum [Member] | Class A Common Stock [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Maximum number of shares available under plan	2,160,106