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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Effective income tax percentage			21.00%		35.00%
Income tax expense	$ 1.1	$ 1.9	$ 6.7	$ 2.9
Unrecognized tax benefits	1.4		1.4		$ 1.5
Accrued Interest included in unrecognized tax benefits	0.2		0.2		$ 0.4
Unrecognized tax benefits if recognized would impact on effective income tax rate	$ 1.4		$ 1.4
Income tax examination description			With a few exceptions, we are no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations by tax authorities for years before 2014.

X

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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A brief description of status of the tax examination, significant findings to date, and the entity's position with respect to the findings.

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

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Amount of unrecognized tax benefits.

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Amount of interest expense accrued for an underpayment of income taxes.

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

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