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Discontinued Operations - Condensed Consolidated Statements of Cash Flows (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Discontinued Operations And Disposal Groups [Abstract] |  |
Proceeds from other assets | $ 2.3 us-gaap_ProceedsFromSaleOfOtherAssetsInvestingActivities | $ 2.3 us-gaap_ProceedsFromSaleOfOtherAssetsInvestingActivities

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- Details
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- Definition Amount of cash inflow from the sale of other assets recognized in investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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