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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
U.S. federal corporate income tax rate	21.00%		35.00%
Adjustment to provisional tax benefit	$ 790,000
Adjustment increase of effective tax rate	1.00%
Effective tax rate	17.10%	15.80%
Accrued interest on unrecognized tax benefits	$ 532,000		$ 327,000
Gross unrecognized tax benefits excluding interest and penalties	27,938		$ 27,345
Net unrecognized tax benefit excluding interest and penalties that would impact effective tax rate	20,525
Net unrecognized tax benefits, excluding interest and penalties, related to foreign tax positions	$ 1,047

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- 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 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 of unrecognized tax benefits.

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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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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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