Variation of Provision for Income Taxes from Statutory U.S. Federal Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Statutory Tax Rate	35.00%
Income taxes computed at the statutory U.S. federal income tax rate	$ 81,171	$ 88,512	$ 99,597
State income taxes, net of federal tax benefit	4,264	4,903	8,165
Tax liabilities (no longer required) required	(408)	2,342	815
Valuation allowance	474	1,441	(3,747)
Manufacturing exemption	(3,613)	(7,849)	(5,798)
Tax credit refunds, net	(2,676)	(2,325)	(2,163)
Foreign earnings taxed at other than 35%	(2,334)	(6,383)	5,957
Deferred tax rate changes	(371)	163	(1,327)
Other	2,059	(331)	662
Provision for income taxes	$ 78,566	$ 80,473	$ 102,161
Effective tax rate	33.90%	31.80%	35.90%