Benefit Plans (Detail)	3 Months Ended	12 Months Ended
Dec. 31, 2011	Dec. 31, 2012	Sep. 30, 2011
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent		6.00%
Defined Contribution Plan, Vested Duration		6 years
Weighted Average Discount Rate, Percent		10.40%
Actuarial present value [Member]
Weighted Average Discount Rate, Percent	4.30%	3.25%	4.30%

The average discount rate applied to insurance contracts to determine future policy benefits to be paid to or on behalf of policyholders.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 60

-Paragraph 60

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 40

-Section 50

-Paragraph 5

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6482714&loc=d3e14881-158438

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