Variation of Provision for Income Taxes from Statutory U.S. Federal Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Statutory Tax Rate	35.00%
Income taxes computed at the statutory U.S. federal income tax rate	$ 88,512	$ 99,597	$ 89,151
State income taxes, net of federal tax benefit	4,903	8,165	7,775
Tax liabilities required (no longer required)	2,342	815	(17,043)
Valuation allowance	1,441	(3,747)	(5,087)
Manufacturing exemption	(7,849)	(5,798)	(7,452)
Tax credit refunds, net	(2,325)	(2,163)	(1,797)
Foreign earnings taxed at other than 35%	(6,383)	5,957	(600)
Deferred tax rate changes	163	(1,327)	2,235
Other	(331)	662	2,123
Provision for income taxes	$ 80,473	$ 102,161	$ 69,305
Effective tax rate	31.80%	35.90%	27.20%