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Comprehensive Income - Schedule of Changes in Balances of Each Component of Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified |  |  | 4 Months Ended | 3 Months Ended | 5 Months Ended | 9 Months Ended | 4 Months Ended | 3 Months Ended | 5 Months Ended | 9 Months Ended | 4 Months Ended | 3 Months Ended | 5 Months Ended | 9 Months Ended | 4 Months Ended | 3 Months Ended | 5 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Dec. 31, 2013 | Apr. 30, 2013 Predecessor Ambac [Member] | Sep. 30, 2014 Successor [Member] | Sep. 30, 2013 Successor [Member] | Sep. 30, 2013 Successor [Member] | Sep. 30, 2014 Successor [Member] | Apr. 30, 2013 Unrealized Gains (Losses) on Available-for-Sale Securities [Member] Predecessor Ambac [Member] | Sep. 30, 2014 Unrealized Gains (Losses) on Available-for-Sale Securities [Member] Successor [Member] | Sep. 30, 2013 Unrealized Gains (Losses) on Available-for-Sale Securities [Member] Successor [Member] | Sep. 30, 2013 Unrealized Gains (Losses) on Available-for-Sale Securities [Member] Successor [Member] | Sep. 30, 2014 Unrealized Gains (Losses) on Available-for-Sale Securities [Member] Successor [Member] | Apr. 30, 2013 Other Postretirement Benefit Plan, Defined Benefit [Member] Predecessor Ambac [Member] | Sep. 30, 2014 Other Postretirement Benefit Plan, Defined Benefit [Member] Successor [Member] | Sep. 30, 2013 Other Postretirement Benefit Plan, Defined Benefit [Member] Successor [Member] | Sep. 30, 2013 Other Postretirement Benefit Plan, Defined Benefit [Member] Successor [Member] | Sep. 30, 2014 Other Postretirement Benefit Plan, Defined Benefit [Member] Successor [Member] | Apr. 30, 2013 Accumulated Translation Adjustment [Member] Predecessor Ambac [Member] | Sep. 30, 2014 Accumulated Translation Adjustment [Member] Successor [Member] | Sep. 30, 2013 Accumulated Translation Adjustment [Member] Successor [Member] | Sep. 30, 2013 Accumulated Translation Adjustment [Member] Successor [Member] | Sep. 30, 2014 Accumulated Translation Adjustment [Member] Successor [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance | $ 250,865 | $ 11,661 | $ 625,385 | $ 306,328 | $ (103,507) | $ 0 | $ 11,661 | $ 651,272 | $ 231,975 | $ (90,983) | $ 0 | $ (41,910) | $ (5,860) | $ 10,439 | $ 0 | $ 0 | $ 10,847 | $ (20,027) | $ 63,914 | $ (12,524) | $ 0 | $ 42,724
Other comprehensive income before reclassifications |  |  | 188,039 | (50,256) | 43,700 | (43,335) | 245,035 | 188,696 | (12,222) | 4,316 | (70,195) | 261,879 | 0 | 0 | 0 | 0 | 0 | (657) | (38,034) | 39,384 | 26,860 | (16,844)
Amounts reclassified from accumulated other comprehensive income |  |  | (13,164) | (5,207) | 49,561 | 33,089 | (5,831) | (13,349) | (5,003) | 49,561 | 33,089 | (5,219) | 185 | (204) | 0 | 0 | (612) |  |  |  | 0 | 0
Elimination Of Predecessor Shareholder Equity And Noncontrolling Interest |  |  | (800,260) |  |  |  |  | (826,619) |  |  |  |  | 5,675 |  |  |  |  | 20,684 |  |  |  |
Net current period other comprehensive income |  |  | (625,385) | (55,463) | 93,261 | (10,246) | 239,204 | (651,272) | (17,225) | 53,877 | (37,106) | 256,660 | 5,860 | (204) | 0 | 0 | (612) | 20,027 | (38,034) | 39,384 | 26,860 | (16,844)
Ending Balance | $ 250,865 | $ 11,661 | $ 0 | $ 250,865 | $ (10,246) | $ (10,246) | $ 250,865 | $ 0 | $ 214,750 | $ (37,106) | $ (37,106) | $ 214,750 | $ 0 | $ 10,235 | $ 0 | $ 0 | $ 10,235 | $ 0 | $ 25,880 | $ 26,860 | $ 26,860 | $ 25,880

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