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Income Taxes - Difference Between Customary Rate and Effective Tax Rate on Income Before Income Taxes Due (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Statutory rate	35.00%	35.00%	35.00%
Tax effect of:
Nondeductible compensation	(0.10%)		(0.90%)
State taxes, net of federal tax benefit	14.70%	1.40%	9.90%
Valuation allowance on deferred tax assets	(54.60%)	(23.50%)	(13.60%)
Other	(0.60%)		(0.20%)
Effective tax rate	(5.60%)	12.90%	30.20%

X

- Definition

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

+ References

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-Publisher FASB
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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 changes in the valuation allowance for deferred tax assets.

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