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Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2013 Policies | Apr. 30, 2013 Ambac [Member] | Apr. 30, 2013 Segregated Account [Member]
Contingencies And Commitments [Line Items] |  |  |
Minimum percentage of payments on permitted policy claims | 25.00% |  |
Number of policies considered for Supplemental Payments | 14 |  |
Payment to settle the IRS dispute and related proceedings |  | $ 1,900 | $ 100,000

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