Document information	9 Months Ended
Sep. 30, 2011
Document Information
Document type	10-Q
Document period end date	Sep. 30, 2011
Amendment flag	false
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q3

If the value is true, then the document as an amendment to previously-filed/accepted document.

Name:	dei_AmendmentFlag
Namespace Prefix:	dei
Data Type:	xbrli:booleanItemType
Balance Type:	na
Period Type:	duration

- Definition

This is focus fiscal period of the document report. For a first quarter 2006 quarterly report, which may also provide financial information from prior periods, the first fiscal quarter should be given as the fiscal period focus. Values: FY, Q1, Q2, Q3, Q4, H1, H2, M9, T1, T2, T3, M8, CY.

+ Details

Name:	dei_DocumentFiscalPeriodFocus
Namespace Prefix:	dei
Data Type:	us-types:fiscalPeriodItemType
Balance Type:	na
Period Type:	duration

- Definition

This is focus fiscal year of the document report in CCYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006.

+ Details

Name:	dei_DocumentFiscalYearFocus
Namespace Prefix:	dei
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- 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:	dei_DocumentInformationLineItems
Namespace Prefix:	dei
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements this will be the filing date. The format of the date is CCYY-MM-DD.

+ Details

Name:	dei_DocumentPeriodEndDate
Namespace Prefix:	dei
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The type of document being provided (such as 10-K, 10-Q, N-1A, etc). The document type should be limited to the same value as the supporting SEC submission type. The acceptable values are as follows: S-1, S-3, S-4, S-11, F-1, F-3, F-4, F-9, F-10, 6-K, 8-K, 10, 10-K, 10-Q, 20-F, 40-F, N-1A, 485BPOS, NCSR, N-Q, and Other.

+ Details

Name:	dei_DocumentType
Namespace Prefix:	dei
Data Type:	us-types:SECReportItemType
Balance Type:	na
Period Type:	duration