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Variable Interest Entities - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Company financial support to VIEs | Company has not provided financial support to these VIEs | Company has not provided financial support to these VIEs | Company has not provided financial support to these VIEs

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- Definition Description of whether the reporting entity has provided financial or other support (explicitly or implicitly) to the Variable Interest Entity (VIE) that it was not previously contractually required to provide or whether reporting entity intends to provide that support, including, for example, (1) the type and amount of support, including situations in which the reporting entity assisted the VIE in obtaining another type of support and (2) the primary reasons for providing the support. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7880789&loc=SL6759159-111685 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4/FIN46(R)-8 -Paragraph C4 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_VariableInterestEntityFinancialOrOtherSupport
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration