Fresh Start Financial Statement Reporting - Schedule of Liabilities Subject to Compromise (Parenthetical) (Detail) (Predecessor Ambac [Member], USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 30, 2013
Predecessor Ambac [Member]
Fresh-Start Adjustment [Line Items]
Litigation settlement amount	$ 14,007

Amount of judgment or settlement awarded to (against) the entity in respect of litigation.

No definition available.

Name:	us-gaap_LitigationSettlementAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration