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Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Quoted Prices in Active Markets for Identical Assets (Level 1), Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified | Dec. 31, 2011
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Assets measured at fair value | $ 10,594
Equity Securities |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Assets measured at fair value | $ 10,594

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration