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Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating Loss Carryforwards [Line Items]
Statutory federal income tax rate	35.00%	35.00%
State taxes, net of credits	3.60%	2.30%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent	0.40%	1.00%
Federal manufacturing deduction	(1.70%)	(3.30%)
Increase in uncertain tax position	2.30%	(13.40%)
Interest accrued on uncertain tax positions	0.10%	0.10%
Other Federal Credits	(0.70%)	(0.40%)
Return to provision adjustments	0.00%	1.40%
Other	(0.20%)	0.10%
Effective tax rate	38.80%	22.80%
Estimated Annual Effective Tax Rate	36.00%	35.00%
Change For Uncertain Tax Positions		$ 1.0

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