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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]
Net deferred income tax assets					$ 50.5
Decrease (increase) in effective tax rate	2.10%	(15.60%)	6.70%	(5.90%)
U.S. corporate tax rate			21.00%		35.00%
Effective tax rate additional tax expense associated with stock compensation		$ 1.5		$ 1.2
Decrease in unrecognized tax positions	$ 1.8		$ 1.8
Interest and penalties	$ 1.7		$ 1.7

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- Definition

Deferred tax assets valuation allowance related to foreign tax credits, state net operating loss and edge credits.

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- Definition

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 discreet tax items.

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Employee service share based compensation tax expense benefit rrom compensation expense

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- Definition

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

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- Definition

The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

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- Definition

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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