Income Taxes - Components of Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Federal
Current	$ 100,479	$ 76,745	$ 62,865
Deferred	(4,335)	10,197	(1,388)
Federal Income Tax Expense (Benefit), Continuing Operations, Total	96,144	86,942	61,477
State
Current	20,219	13,558	10,908
Deferred	270	372	(221)
State and Local Income Tax Expense (Benefit), Continuing Operations, Total	20,489	13,930	10,687
Foreign
Current	135,152	118,991	90,311
Deferred	0	0	0
Foreign Income Tax Expense (Benefit), Continuing Operations, Total	135,152	118,991	90,311
Total
Current	255,850	209,294	164,084
Deferred	(4,065)	10,569	(1,609)
Income tax expense	$ 251,785	$ 219,863	$ 162,475