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Net Earnings (Loss) per Common Share - Calculation of Basic and Diluted Net Earnings (Loss) Per Common Share (Parenthetical) (Detail) In Millions, unless otherwise specified | Dec. 31, 2014
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Earnings Per Share [Abstract] |
Common stock reserved | 18 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration