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Financial Instruments with Off-Balance-Sheet Risk - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Letter Of Credit	$ 74

X

- Details

Name:	us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant