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Differences between Statutory Federal Income Tax Rate and Effective Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal tax benefit	3.60%	3.30%	3.70%
Valuation allowance	(3.70%)	1.70%	(4.50%)
Domestic production deduction	(2.40%)	(2.20%)	(2.10%)
Tax planning benefits, excluding valuation allowance effects	0.00%	(6.00%)	0.00%
Tax reserves	(1.00%)	0.20%	(1.20%)
Tax credits	(0.80%)	1.90%	(0.60%)
Foreign tax rate effects	0.80%	0.50%	(2.00%)
Other, net	(0.90%)	(0.30%)	0.10%
Effective income tax rate	30.60%	34.10%	28.40%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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