Variation of Provision for Income Taxes from Statutory U.S. Federal Income Tax Rate (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Statutory Tax Rate	35.00%
Income taxes computed at the statutory U.S. federal income tax rate	$ 89,151	$ 78,325	$ 101,559
State income taxes, net of federal tax benefit	7,775	5,978	8,557
Tax liabilities (no longer required) required	(17,043)	(182)	507
Valuation allowance	(5,087)	239	(6,662)
Manufacturing exemption	(7,452)	(6,865)	(5,128)
Tax credit refunds, net	(1,797)	(1,066)	(3,165)
Foreign earnings taxed at other than 35%	(600)	(566)	94
Deferred tax rate changes	2,235	(3,422)	0
Other	2,123	0	1,232
Provision for income taxes	$ 69,305	$ 72,441	$ 96,994
Effective tax rate	27.20%	32.40%	33.40%