Income Taxes (Detail) - Components of Income Tax Expenses (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current tax expense:
U.S. federal	$ 25,290	$ 23,327	$ 9,078
State and local	2,508	4,236	2,645
Foreign	18,889	13,845	10,341
Total current	46,687	41,408	22,064
Deferred tax (benefit) expense:
U.S. federal	8,494	(5,192)	4,263
State and local	(753)	1,269	72
Foreign	(8,080)	(1,434)	(6,013)
Total deferred	(339)	(5,357)	(1,678)
Total current and deferred	46,348	36,051	20,386
Total tax expense	69,693	65,282	37,800
Benefit (Expense) Relating to Interest Rate Swap Used to Increase (Decrease) Equity [Member]
Deferred tax (benefit) expense:
Benefit	51	3,134	(2,523)
Benefit From Stock Transactions With Employees Used To Increase Equity
Deferred tax (benefit) expense:
Benefit	21,304	25,812	18,559
Benefit (Expense) Relating to Defined Benefit Pension Adjustments Used to Increase (Decrease) Equity [Member]
Deferred tax (benefit) expense:
Benefit	1,926	285	375
Benefit (Expense) of Acquired Tax Assets (Liabilities) Used to Decrease (Increase) Goodwill [Member]
Deferred tax (benefit) expense:
Benefit	$ 64		$ 1,003