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Differences between Statutory Federal Income Tax Rate and Effective Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal tax benefit	3.30%	3.70%	3.30%
Valuation allowance	1.70%	(4.50%)	(279.40%)
Domestic production deduction	(2.20%)	(2.10%)	(1.50%)
Tax planning benefits, excluding valuation allowance effects	(6.00%)	0.00%	0.00%
Asset dispositions and write-offs	0.00%	0.00%	(3.30%)
Repatriation effects	0.00%	0.00%	1.80%
Tax reserves	0.20%	(1.20%)	0.00%
Tax credits	1.90%	(0.60%)	(1.80%)
Foreign tax rate effects	0.50%	(2.00%)	(2.70%)
Other, net	(0.30%)	0.10%	1.20%
Effective income tax rate	34.10%	28.40%	(247.40%)

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