Segment Reporting - Financial Results by Reportable Segment Reconciled to Consolidated Income Before Income Taxes and Total Assets by Reportable Segment Reconciled to Consolidated Total Assets (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Total revenues	$ 317,492,000	$ 386,000,000	$ 413,713,000	$ 369,948,000	$ 402,839,000	$ 489,167,000	$ 595,964,000	$ 314,529,000	$ 1,487,153,000	$ 1,802,499,000	$ 623,807,000
Interest expense									303,103,000	272,655,000	179,671,000
Depreciation and amortization									72,721,000	71,027,000	49,267,000
Goodwill impairment			82,269,000						82,269,000	0	0
Other expenses, net									1,166,936,000	1,039,571,000	388,962,000
Income (loss) before income taxes	(109,060,000)	12,681,000	(51,926,000)	28,965,000	6,905,000	120,818,000	238,571,000	46,524,000	(119,340,000)	412,818,000	(35,451,000)
Total assets	18,991,977,000				17,387,529,000				18,991,977,000	17,387,529,000
Interest Income on Loans									134,555,000	144,651,000	154,351,000
Net servicing revenue and fees									601,510,000	783,389,000	368,509,000
Asset Management Performance Fees Collected		2,500,000	34,200,000						36,800,000
Servicing [Member]
Segment Reporting Information [Line Items]
Goodwill impairment									0
Originations [Member]
Segment Reporting Information [Line Items]
Goodwill impairment									0
Reverse Mortgage [Member]
Segment Reporting Information [Line Items]
Goodwill impairment									82,269,000
Asset Receivables Management [Member]
Segment Reporting Information [Line Items]
Goodwill impairment									0
Insurance [Member]
Segment Reporting Information [Line Items]
Goodwill impairment									0
Operating Segments [Member] | Servicing [Member]
Segment Reporting Information [Line Items]
Total revenues									563,466,000	741,778,000	348,931,000
Interest expense									43,998,000	25,921,000	4,882,000
Depreciation and amortization									35,275,000	37,872,000	34,719,000
Goodwill impairment									0
Other expenses, net									625,267,000	452,978,000	262,515,000
Income (loss) before income taxes									(142,475,000)	224,157,000	45,759,000
Total assets	4,777,980,000				4,261,119,000				4,777,980,000	4,261,119,000
Net servicing revenue and fees									530,800,000	715,700,000	325,700,000
Servicing Revenue and Fees									19,700,000	18,800,000	20,400,000
Operating Segments [Member] | Originations [Member]
Segment Reporting Information [Line Items]
Total revenues									481,822,000	630,441,000	5,917,000
Interest expense									29,841,000	28,469,000	20,000
Depreciation and amortization									19,007,000	10,836,000	132,000
Goodwill impairment									0
Other expenses, net									295,894,000	328,150,000	8,140,000
Income (loss) before income taxes									137,080,000	262,986,000	(2,375,000)
Total assets	1,493,851,000				1,450,366,000				1,493,851,000	1,450,366,000
Operating Segments [Member] | Reverse Mortgage [Member]
Segment Reporting Information [Line Items]
Total revenues									157,161,000	167,664,000	13,565,000
Interest expense									3,773,000	7,974,000	1,217,000
Depreciation and amortization									9,334,000	11,145,000	1,236,000
Goodwill impairment									82,269,000
Other expenses, net									166,210,000	148,193,000	7,991,000
Income (loss) before income taxes									(104,425,000)	352,000	3,121,000
Total assets	10,476,947,000				9,192,799,000				10,476,947,000	9,192,799,000
Net servicing revenue and fees									35,400,000	27,300,000	4,400,000
Operating Segments [Member] | Asset Receivables Management [Member]
Segment Reporting Information [Line Items]
Total revenues									58,230,000	40,942,000	38,925,000
Interest expense									0	0	0
Depreciation and amortization									4,579,000	6,260,000	7,774,000
Goodwill impairment									0
Other expenses, net									27,152,000	22,840,000	22,623,000
Income (loss) before income taxes									26,499,000	11,842,000	8,528,000
Total assets	107,232,000				51,699,000				107,232,000	51,699,000
Net servicing revenue and fees									35,300,000	40,400,000	38,400,000
Servicing Revenue and Fees									500,000	400,000	500,000
Operating Segments [Member] | Insurance [Member]
Segment Reporting Information [Line Items]
Total revenues									71,030,000	84,507,000	73,908,000
Interest expense									0	0	0
Depreciation and amortization									4,489,000	4,883,000	5,377,000
Goodwill impairment									0
Other expenses, net									27,353,000	33,655,000	35,175,000
Income (loss) before income taxes									39,188,000	45,969,000	33,356,000
Total assets	129,104,000				223,191,000				129,104,000	223,191,000
Operating Segments [Member] | Loans and Residuals [Member]
Segment Reporting Information [Line Items]
Total revenues									134,469,000	144,660,000	154,356,000
Interest expense									77,858,000	86,974,000	96,337,000
Depreciation and amortization									0	0	0
Goodwill impairment									0
Other expenses, net									25,446,000	25,417,000	41,975,000
Income (loss) before income taxes									31,026,000	32,450,000	15,928,000
Total assets	1,394,498,000				1,497,882,000				1,394,498,000	1,497,882,000
Interest Income on Loans									134,500,000	144,700,000	154,400,000
Operating Segments [Member] | Other Segments [Member]
Segment Reporting Information [Line Items]
Total revenues									41,179,000	11,714,000	9,206,000
Interest expense									147,633,000	123,317,000	77,215,000
Depreciation and amortization									37,000	31,000	29,000
Goodwill impairment									0
Other expenses, net									19,818,000	47,545,000	31,544,000
Income (loss) before income taxes									(106,233,000)	(164,938,000)	(139,768,000)
Total assets	1,297,068,000				1,861,922,000				1,297,068,000	1,861,922,000
Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenues									(20,204,000)	(19,207,000)	(21,001,000)
Interest expense									0	0	0
Depreciation and amortization									0	0	0
Goodwill impairment									0
Other expenses, net									(20,204,000)	(19,207,000)	(21,001,000)
Income (loss) before income taxes									0	0	0
Total assets	$ (684,703,000)				$ (1,151,449,000)				$ (684,703,000)	$ (1,151,449,000)