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