Income Taxes - Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
U.S. Federal									$ 25,319	$ 18,410	$ 8,850
U.S. State and local									2,436	1,113	1,251
Foreign									15,172	17,379	11,531
Total current income tax expense									42,927	36,902	21,632
Deferred:
U.S. Federal									7,785	4,440	15,466
U.S. State and local									(823)	2,042	1,205
Foreign									2,016	(1,930)	1,386
Total deferred income tax expense									8,978	4,552	18,057
Income tax expense	$ 14,008	$ 9,349	$ 18,937	$ 9,611	$ 6,501	$ 8,448	$ 18,099	$ 8,406	$ 51,905	$ 41,454	$ 39,689