Reconciliation of Statutory U.S. Federal Tax Rate to Effective Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Statutory rate	35.00%	35.00%	35.00%
Non-deductible EC charge	25.80%	0.00%	0.00%
State	2.90%	2.10%	2.00%
Federal domestic production deduction	(2.60%)	(1.80%)	(1.80%)
Tax on foreign earnings	(7.40%)	(2.70%)	(1.60%)
Other, net	0.10%	(1.20%)	(0.90%)
Effective income tax rate	53.80%	31.40%	32.70%