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Income Taxes - Summary of Information Related to Interest and Penalties on Uncertain Tax Positions (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Accrued interest payable	$ 0.6us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	$ 0.6us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	$ 1.4us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued
Interest expense (income)		(0.8)us-gaap_IncomeTaxExaminationInterestExpense	(0.3)us-gaap_IncomeTaxExaminationInterestExpense
Penalties	$ 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense	$ 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense	$ 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense

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- Definition

The amount of estimated interest recognized in the period arising from income tax examinations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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- Definition

Amount of expense for penalties related to a tax position claimed or expected to be claimed in the tax return.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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