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Schedule II Valuation and Qualifying Accounts - Deferred Tax Asset Valuation Allowance (Parenthetical) (Detail) - USD ($) | 12 Months Ended
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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

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- 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

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- 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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- Details
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Data Type: | na
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