Segment Information - Summary of Financial Information by Reportable Segment (Detail) (USD $) In Thousands, unless otherwise specified			2 Months Ended	3 Months Ended	6 Months Ended	2 Months Ended	3 Months Ended	6 Months Ended	2 Months Ended	3 Months Ended	6 Months Ended	1 Months Ended	4 Months Ended	1 Months Ended	4 Months Ended	1 Months Ended	4 Months Ended	2 Months Ended	3 Months Ended	6 Months Ended	2 Months Ended	3 Months Ended	6 Months Ended	2 Months Ended	3 Months Ended	6 Months Ended	2 Months Ended	3 Months Ended	6 Months Ended	2 Months Ended	3 Months Ended	6 Months Ended	2 Months Ended	3 Months Ended	6 Months Ended	2 Months Ended	3 Months Ended	6 Months Ended	2 Months Ended	3 Months Ended	6 Months Ended	2 Months Ended	3 Months Ended	6 Months Ended	2 Months Ended	3 Months Ended	6 Months Ended	2 Months Ended	3 Months Ended	6 Months Ended	2 Months Ended	3 Months Ended	6 Months Ended	1 Months Ended	4 Months Ended	1 Months Ended	4 Months Ended	1 Months Ended	4 Months Ended	1 Months Ended	4 Months Ended	1 Months Ended	4 Months Ended	1 Months Ended	4 Months Ended	1 Months Ended	4 Months Ended	1 Months Ended	4 Months Ended	1 Months Ended	4 Months Ended	1 Months Ended	4 Months Ended	1 Months Ended	4 Months Ended	1 Months Ended	4 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013 Successor [Member]	Jun. 30, 2014 Successor [Member]	Jun. 30, 2014 Successor [Member]	Jun. 30, 2013 Successor [Member] Unaffiliated Customers [Member]	Jun. 30, 2014 Successor [Member] Unaffiliated Customers [Member]	Jun. 30, 2014 Successor [Member] Unaffiliated Customers [Member]	Jun. 30, 2013 Successor [Member] Intersegment [Member]	Jun. 30, 2014 Successor [Member] Intersegment [Member]	Jun. 30, 2014 Successor [Member] Intersegment [Member]	Apr. 30, 2013 Predecessor [Member]	Apr. 30, 2013 Predecessor [Member]	Apr. 30, 2013 Predecessor [Member] Unaffiliated Customers [Member]	Apr. 30, 2013 Predecessor [Member] Unaffiliated Customers [Member]	Apr. 30, 2013 Predecessor [Member] Intersegment [Member]	Apr. 30, 2013 Predecessor [Member] Intersegment [Member]	Jun. 30, 2013 Operating Segments [Member] Successor [Member] Inter-segment Eliminations [Member]	Jun. 30, 2014 Operating Segments [Member] Successor [Member] Inter-segment Eliminations [Member]	Jun. 30, 2014 Operating Segments [Member] Successor [Member] Inter-segment Eliminations [Member]	Jun. 30, 2013 Operating Segments [Member] Successor [Member] Inter-segment Eliminations [Member] Unaffiliated Customers [Member]	Jun. 30, 2014 Operating Segments [Member] Successor [Member] Inter-segment Eliminations [Member] Unaffiliated Customers [Member]	Jun. 30, 2014 Operating Segments [Member] Successor [Member] Inter-segment Eliminations [Member] Unaffiliated Customers [Member]	Jun. 30, 2013 Operating Segments [Member] Successor [Member] Inter-segment Eliminations [Member] Intersegment [Member]	Jun. 30, 2014 Operating Segments [Member] Successor [Member] Inter-segment Eliminations [Member] Intersegment [Member]	Jun. 30, 2014 Operating Segments [Member] Successor [Member] Inter-segment Eliminations [Member] Intersegment [Member]	Jun. 30, 2013 Operating Segments [Member] Successor [Member] Financial Guarantee [Member]	Jun. 30, 2014 Operating Segments [Member] Successor [Member] Financial Guarantee [Member]	Jun. 30, 2014 Operating Segments [Member] Successor [Member] Financial Guarantee [Member]	Jun. 30, 2013 Operating Segments [Member] Successor [Member] Financial Guarantee [Member] Unaffiliated Customers [Member]	Jun. 30, 2014 Operating Segments [Member] Successor [Member] Financial Guarantee [Member] Unaffiliated Customers [Member]	Jun. 30, 2014 Operating Segments [Member] Successor [Member] Financial Guarantee [Member] Unaffiliated Customers [Member]	Jun. 30, 2013 Operating Segments [Member] Successor [Member] Financial Guarantee [Member] Intersegment [Member]	Jun. 30, 2014 Operating Segments [Member] Successor [Member] Financial Guarantee [Member] Intersegment [Member]	Jun. 30, 2014 Operating Segments [Member] Successor [Member] Financial Guarantee [Member] Intersegment [Member]	Jun. 30, 2013 Operating Segments [Member] Successor [Member] Financial Services [Member]	Jun. 30, 2014 Operating Segments [Member] Successor [Member] Financial Services [Member]	Jun. 30, 2014 Operating Segments [Member] Successor [Member] Financial Services [Member]	Jun. 30, 2013 Operating Segments [Member] Successor [Member] Financial Services [Member] Unaffiliated Customers [Member]	Jun. 30, 2014 Operating Segments [Member] Successor [Member] Financial Services [Member] Unaffiliated Customers [Member]	Jun. 30, 2014 Operating Segments [Member] Successor [Member] Financial Services [Member] Unaffiliated Customers [Member]	Jun. 30, 2013 Operating Segments [Member] Successor [Member] Financial Services [Member] Intersegment [Member]	Jun. 30, 2014 Operating Segments [Member] Successor [Member] Financial Services [Member] Intersegment [Member]	Jun. 30, 2014 Operating Segments [Member] Successor [Member] Financial Services [Member] Intersegment [Member]	Jun. 30, 2013 Operating Segments [Member] Successor [Member] Corporate and Other [Member]	Jun. 30, 2014 Operating Segments [Member] Successor [Member] Corporate and Other [Member]	Jun. 30, 2014 Operating Segments [Member] Successor [Member] Corporate and Other [Member]	Jun. 30, 2013 Operating Segments [Member] Successor [Member] Corporate and Other [Member] Unaffiliated Customers [Member]	Jun. 30, 2014 Operating Segments [Member] Successor [Member] Corporate and Other [Member] Unaffiliated Customers [Member]	Jun. 30, 2014 Operating Segments [Member] Successor [Member] Corporate and Other [Member] Unaffiliated Customers [Member]	Jun. 30, 2013 Operating Segments [Member] Successor [Member] Corporate and Other [Member] Intersegment [Member]	Jun. 30, 2014 Operating Segments [Member] Successor [Member] Corporate and Other [Member] Intersegment [Member]	Jun. 30, 2014 Operating Segments [Member] Successor [Member] Corporate and Other [Member] Intersegment [Member]	Apr. 30, 2013 Operating Segments [Member] Predecessor [Member] Inter-segment Eliminations [Member]	Apr. 30, 2013 Operating Segments [Member] Predecessor [Member] Inter-segment Eliminations [Member]	Apr. 30, 2013 Operating Segments [Member] Predecessor [Member] Inter-segment Eliminations [Member] Unaffiliated Customers [Member]	Apr. 30, 2013 Operating Segments [Member] Predecessor [Member] Inter-segment Eliminations [Member] Unaffiliated Customers [Member]	Apr. 30, 2013 Operating Segments [Member] Predecessor [Member] Inter-segment Eliminations [Member] Intersegment [Member]	Apr. 30, 2013 Operating Segments [Member] Predecessor [Member] Inter-segment Eliminations [Member] Intersegment [Member]	Apr. 30, 2013 Operating Segments [Member] Predecessor [Member] Financial Guarantee [Member]	Apr. 30, 2013 Operating Segments [Member] Predecessor [Member] Financial Guarantee [Member]	Apr. 30, 2013 Operating Segments [Member] Predecessor [Member] Financial Guarantee [Member] Unaffiliated Customers [Member]	Apr. 30, 2013 Operating Segments [Member] Predecessor [Member] Financial Guarantee [Member] Unaffiliated Customers [Member]	Apr. 30, 2013 Operating Segments [Member] Predecessor [Member] Financial Guarantee [Member] Intersegment [Member]	Apr. 30, 2013 Operating Segments [Member] Predecessor [Member] Financial Guarantee [Member] Intersegment [Member]	Apr. 30, 2013 Operating Segments [Member] Predecessor [Member] Financial Services [Member]	Apr. 30, 2013 Operating Segments [Member] Predecessor [Member] Financial Services [Member]	Apr. 30, 2013 Operating Segments [Member] Predecessor [Member] Financial Services [Member] Unaffiliated Customers [Member]	Apr. 30, 2013 Operating Segments [Member] Predecessor [Member] Financial Services [Member] Unaffiliated Customers [Member]	Apr. 30, 2013 Operating Segments [Member] Predecessor [Member] Financial Services [Member] Intersegment [Member]	Apr. 30, 2013 Operating Segments [Member] Predecessor [Member] Financial Services [Member] Intersegment [Member]	Apr. 30, 2013 Operating Segments [Member] Predecessor [Member] Corporate and Other [Member]	Apr. 30, 2013 Operating Segments [Member] Predecessor [Member] Corporate and Other [Member]	Apr. 30, 2013 Operating Segments [Member] Predecessor [Member] Corporate and Other [Member] Unaffiliated Customers [Member]	Apr. 30, 2013 Operating Segments [Member] Predecessor [Member] Corporate and Other [Member] Unaffiliated Customers [Member]	Apr. 30, 2013 Operating Segments [Member] Predecessor [Member] Corporate and Other [Member] Intersegment [Member]	Apr. 30, 2013 Operating Segments [Member] Predecessor [Member] Corporate and Other [Member] Intersegment [Member]	Jun. 30, 2013 Corporate and Other [Member] Successor [Member]	Apr. 30, 2013 Corporate and Other [Member] Predecessor [Member]
Revenues:
Total revenues before expenses and reorganization items			$ 242,415	$ 57,333	$ 166,471	$ 242,415	$ 57,333	$ 166,471	$ 0	$ 0	$ 0	$ 349,516	$ 640,388	$ 349,516	$ 640,388	$ 0	$ 0	$ (5,450)	$ (8,554)	$ (17,489)	$ 0	$ 0	$ 0	$ (5,450)	$ (8,554)	$ (17,489)	$ 160,304	$ 105,028	$ 267,956	$ 159,905	$ 104,703	$ 267,256	$ 399	$ 325	$ 700	$ 82,116	$ (48,018)	$ (101,531)	$ 82,490	$ (47,411)	$ (100,849)	$ (374)	$ (607)	$ (682)	$ 5,445	$ 8,877	$ 17,535	$ 20	$ 41	$ 64	$ 5,425	$ 8,836	$ 17,471	$ (197,071)	$ (197,113)	$ 0	$ 0	$ (197,071)	$ (197,113)	$ 382,986	$ 633,950	$ 382,772	$ 633,010	$ 214	$ 940	$ (33,464)	$ 6,457	$ (33,266)	$ 7,339	$ (198)	$ (882)	$ 197,065	$ 197,094	$ 10	$ 39	$ 197,055	$ 197,055
Pre-tax income (loss) from continuing operations:
Pre-tax income (loss) from continuing operations			205,795	(210,412)	(51,114)	205,795	(210,412)	(51,114)	0	0	0	3,065,124	3,348,033	3,065,124	3,348,033	0	0	0	0	0	0	0	0	0	0	0	119,393	(170,082)	37,022	124,890	(160,685)	55,576	(5,497)	(9,397)	(18,554)	81,169	(48,869)	(103,852)	81,692	(48,454)	(102,983)	(523)	(415)	(869)	5,233	8,539	15,716	(787)	(1,273)	(3,707)	6,020	9,812	19,423	0	0	0	0	0	0	1,386,350	1,632,978	1,583,465	1,830,165	(197,115)	(197,187)	(35,866)	2,132	(35,614)	3,233	(252)	(1,101)	1,714,640	1,712,923	1,517,273	1,514,635	197,367	198,288
Total assets	27,723,353	27,092,477	27,475,367	27,723,353	27,723,353							28,853,435	28,853,435					0	0	0							26,934,044	27,319,461	27,319,461							486,346	365,874	365,874								38,018	38,018							0	0					28,287,321	28,287,321					536,711	536,711					29,403	29,403					54,977	29,403
Net investment income			26,196	80,093	150,894							32,226	116,740					0	0	0							26,015	79,633	150,017							158	419	813							23	41	64							0	0					31,855	115,129					361	1,572					10	39
Amortization of insurance intangible assets			24,952	36,256	67,970							0	0					0	0	0							24,952	36,256	67,970							0	0	0							0	0	0
Interest expense			21,144	31,953	64,281							7,860	31,025					0	0	0							20,776	31,514	63,395							368	439	886							0	0	0							0	0					7,542	29,718					318	1,307					0	0
Reorganization items			$ 424	$ 186	$ 209							$ (2,747,239)	$ (2,745,180)					$ 0	$ 0	$ 0							$ 0	$ 0	$ 0							$ 0	$ 0	$ 0							$ 424	$ 186	$ 209							$ 0	$ 0					$ (1,231,550)	$ (1,231,550)					$ 1,505	$ 1,505					$ (1,517,194)	$ (1,515,135)