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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Effective tax benefit rate	45.30%	108.10%	45.20%	(79.80%)
U.S. federal statutory rate	35.00%	35.00%	35.00%	35.00%
Unrecognized tax benefits	$ 2.0		$ 2.0		$ 1.9
Accrued interest payable for taxes	0.1		0.1		0.1
Liability for income tax penalties	$ 0.0		$ 0.0		$ 0.0

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- Definition

Liability for Income Tax Penalties

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Amount of interest expense accrued for an underpayment of income taxes.

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