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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]
Tax Cuts and Jobs Act incomplete accounting transition tax unrepatriated earnings foreign subsidiaries payable period			8 years
U.S. federal statutory tax rate	21.00%		35.00%
Effective income tax rate	28.00%	28.00%
Unrecognized tax benefits	$ 0
Unrecognized tax benefits recorded during period	$ 0

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Tax Cuts and Jobs Act incomplete accounting transition tax unrepatriated earnings foreign subsidiaries payable period.

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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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.

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Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.

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