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Income Taxes - Reconciliation of Statutory Federal Tax Rate to Effective Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Federal statutory tax rate	35.00%	34.00%	34.00%
Earnings excluded from Federal tax	0.00%	0.00%	(14.00%)
State income taxes, net of Federal income tax benefit	4.00%	4.00%	29.00%
Nondeductible expenses	3.00%	4.00%	4.00%
Research credit, Federal benefit	(1.00%)	(0.00%)	(0.00%)
Section 199 - Qualified production activities	(3.00%)	(0.00%)	(0.00%)
Other	0.00%	(1.00%)	3.00%
Effective income tax rate	38.00%	41.00%	56.00%

X

- Definition

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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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit.

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