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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2015
Income Tax Reconciliation [Line Items]
Effective income tax rate	90.00%	52.00%	45.00%	39.00%
U.S.federal statutory tax rate	35.00%		35.00%
Net change in valuation allowance from prior year	$ 0		$ 0
Unrecognized tax benefits	$ 200,000		$ 200,000
Scenario, Forecast [Member]
Income Tax Reconciliation [Line Items]
Effective income tax rate					33.00%

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Income Tax Reconciliation [Line Items]

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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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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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