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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