Income Taxes - Components of Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Federal
Current	$ 86,606	$ 100,479	$ 76,745
Deferred	11,864	(4,335)	10,197
Federal income tax expense, total	98,470	96,144	86,942
State
Current	12,704	20,219	13,558
Deferred	(225)	270	372
State and local income tax expense, total	12,479	20,489	13,930
Foreign
Current	106,475	135,152	118,991
Deferred	0	0	0
Foreign income tax expense, total	106,475	135,152	118,991
Total
Current	205,785	255,850	209,294
Deferred	11,639	(4,065)	10,569
Income tax expense	$ 217,424	$ 251,785	$ 219,863