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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended | 6 Months Ended
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Sep. 19, 2012 | Mar. 31, 2010 | Jun. 30, 2013
Commitments And Contingencies Disclosure [Abstract] |  |  |
Settlement to resolve investigation matters |  | $ 40.2 |
Litigation Settlement period for payment |  |  | 4 years
Stated claim inclusive of costs and expenses | 42.3 |  |
Contingent liabilities |  |  | $ 5.8

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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