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Investments - Summary of Roll-Forward of Ambac's Cumulative Credit Losses on Debt Securities for Which Portion of Other-than-Temporary Impairment was Recognized in Other Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
 8 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2013
Successor Ambac [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Balance at beginning    $ 183,300 $ 201,317
Additions for credit impairments recognized on:      
Securities not previously impaired 1,185    824
Securities previously impaired       5,166
Reductions for credit impairments previously recognized on:      
Securities that matured or were sold during the period (3) (183,300) (24,007)
Securities that no longer have a portion of other-than-temporary impairment in other comprehensive income because of the company's intent to sell such securities       
Balance at end $ 1,182    $ 183,300