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Discontinued Operations and Divestitures - Additional Information (Detail) | 3 Months Ended
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Mar. 31, 2014 Operations | Mar. 31, 2013 Operations
Discontinued Operations And Disposal Groups [Abstract] |  |
Discontinued Operations, Number of Operations Sold | 0 | 0

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- Definition "Discontinued operations number of operations sold. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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