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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
Income Tax Disclosure [Abstract]
Effective tax rate	28.00%	52.00%	57.00%	25.00%
Federal statutory rate			21.00%		35.00%
Increase (decrease) in income tax due to change in fair value of contingent consideration		$ 0.9	$ 1.2	$ (2.0)

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- Definition

Income tax reconciliation change in fair value of contingent consideration from business combination.

+ References

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- Definition

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
-Topic 235
-SubTopic 10
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- Definition

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

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