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Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) (Quoted Prices in Active Markets for Identical Assets (Level 1), Fair Value, Measurements, Recurring, USD $) In Thousands | Sep. 30, 2011
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Assets measured at fair value | $ 10,151
Equity Securities |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Assets measured at fair value | $ 10,151

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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. + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + Details
Name: | us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix: | us-gaap
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration