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Schedule II Valuation and Qualifying Accounts - Deferred Tax Asset Valuation Allowance (Parenthetical) (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowance Recorded	$ 339,800,000	$ 143,500,000
Deferred Tax Asset Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowance Recorded	$ 339.8	$ 143.5

X

- Definition

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 740



-SubTopic 10



-Section 45



-Paragraph 20



-URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318

+ Details

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Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- Details

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