Income Taxes - Summary of Provision for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:
U.S. federal	$ 120,806	$ 11,316	$ 1,292
U.S. state and local	41,635	2,970	1,319
Foreign	1,089	17,849	9,853
UBT	10,625	(361)	1,572
Current Income Tax Expense (Benefit)	174,155	31,774	14,036
Deferred:
U.S. federal	(35,248)	(6,741)	2,766
U.S. state and local	(17,344)	(1,918)	(645)
Foreign	(29,532)	(2,352)	(294)
UBT	135	(539)	136
Deferred Income Tax Expense (Benefit), Total	(81,989)	(11,550)	1,963
Provision for income taxes	$ 92,166	$ 20,224	$ 15,999