Fresh Start Accounting - Additional Information (Detail) (USD $)	9 Months Ended
Sep. 30, 2013	Dec. 31, 2012	Mar. 19, 2012
Statement Of Financial Position [Abstract]
Minimum percentage of shares held by voter before confirmation of reorganization	50.00%
Company's reorganization value			$ 76,600,000
Loss contract fair market value reserve	$ 51,230,000	$ 52,217,000	$ 63,100,000

Amount attributed to the reconstituted entity, as well as the expected net realizable value of those assets that will be disposed before reconstitution occurs.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Reorganization Value

-URI http://asc.fasb.org/extlink&oid=29635974

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 852

-SubTopic 10

-Section 55

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=29642632&loc=d3e56426-112766

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 852

-SubTopic 10

-Section 05

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=6458260&loc=d3e54813-112758

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 852

-SubTopic 10

-Section 55

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=29642632&loc=d3e56239-112766

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant