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Fair Value Measurements - Summary of Gains and Losses (Realized and Unrealized) Relating to Level 3 Assets and Liabilities Included in Earnings (Detail) (USD $)
In Thousands, unless otherwise specified
 8 Months Ended 4 Months Ended 12 Months Ended 8 Months Ended 4 Months Ended 12 Months Ended 8 Months Ended 4 Months Ended 12 Months Ended 8 Months Ended 4 Months Ended 12 Months Ended 8 Months Ended 4 Months Ended 12 Months Ended 8 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2013
Successor Ambac [Member]
Variable Interest Entity [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
Variable Interest Entity [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Variable Interest Entity [Member]
Dec. 31, 2013
Realized Gains Or (Losses) and Other Settlements On Credit Derivative Contracts [Member]
Successor Ambac [Member]
Apr. 30, 2013
Realized Gains Or (Losses) and Other Settlements On Credit Derivative Contracts [Member]
Predecessor Ambac [Member]
Dec. 31, 2012
Realized Gains Or (Losses) and Other Settlements On Credit Derivative Contracts [Member]
Predecessor Ambac [Member]
Dec. 31, 2013
Unrealized Gains Or (Losses) On Credit Derivative Contracts [Member]
Successor Ambac [Member]
Apr. 30, 2013
Unrealized Gains Or (Losses) On Credit Derivative Contracts [Member]
Predecessor Ambac [Member]
Dec. 31, 2012
Unrealized Gains Or (Losses) On Credit Derivative Contracts [Member]
Predecessor Ambac [Member]
Dec. 31, 2013
Interest Rate Swaps [Member]
Successor Ambac [Member]
Apr. 30, 2013
Interest Rate Swaps [Member]
Predecessor Ambac [Member]
Dec. 31, 2012
Interest Rate Swaps [Member]
Predecessor Ambac [Member]
Dec. 31, 2013
Other Income [Member]
Successor Ambac [Member]
Apr. 30, 2013
Other Income [Member]
Predecessor Ambac [Member]
Dec. 31, 2012
Other Income [Member]
Predecessor Ambac [Member]
Dec. 31, 2013
Net Investment Income [Member]
Successor Ambac [Member]
Apr. 30, 2013
Net Investment Income [Member]
Predecessor Ambac [Member]
Dec. 31, 2012
Net Investment Income [Member]
Predecessor Ambac [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                                    
Total gains or losses included in earnings for the period                               $ 1,870 $ (33) $ (3)
Total gains or losses included in earnings for the period (636,043) 1,146,256 702,496 9,778 3,444 13,713 183,091 (63,828) (22,932) 24,797 (28,162) (70,415) (677) (496) 98,488      
Changes in unrealized gains or losses relating to the assets and liabilities still held at the reporting date $ (655,964) $ 1,146,256 $ 702,977          $ 66,639 $ (63,840) $ (35,331) $ 24,797 $ (28,162) $ (78,505) $ (677) $ (496) $ (2,222)