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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
U.S. federal corporate income tax rate		35.00%	21.00%	35.00%	35.00%
Adjustment to provisional tax expense	$ 863
Adjustment increase of effective tax rate			0.30%
Effective tax rate	18.50%	25.00%	17.60%	22.30%
Accrued interest on unrecognized tax benefits	$ 511		$ 511		$ 327
Gross unrecognized tax benefits excluding interest and penalties	32,535		32,535		$ 27,345
Net unrecognized tax benefit excluding interest and penalties that would impact effective tax rate	$ 25,008		25,008
Net unrecognized tax benefits, excluding interest and penalties, related to foreign tax positions			$ 1,521

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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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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 income tax rates.

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Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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