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
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
REVENUES
Total revenues	$ 310,857,000	$ 369,948,000
EXPENSES
Interest expense	74,871,000	74,849,000
Depreciation and amortization	16,632,000	18,644,000
Income (loss) before income taxes	(49,678,000)	28,965,000
Total assets	19,308,167,000		18,991,977,000
Net servicing revenue and fees	90,887,000	172,792,000
Interest income on loans	31,941,000	34,422,000
Operating Segments [Member] | Servicing [Member]
REVENUES
Total revenues	143,763,000	245,584,000
EXPENSES
Interest expense	29,225,000	30,716,000
Depreciation and amortization	11,473,000	11,839,000
Income (loss) before income taxes	(50,672,000)	66,376,000
Total assets	6,283,525,000		6,405,781,000
Net servicing revenue and fees	79,500,000	165,200,000
Servicing Fees Net Intercompany	2,300,000	2,000,000
Interest income on loans	31,900,000	34,400,000
Intersegment Retention Revenue	8,100,000	12,000,000
Operating Segments [Member] | Originations [Member]
REVENUES
Total revenues	130,300,000	109,214,000
EXPENSES
Interest expense	7,813,000	6,833,000
Depreciation and amortization	3,187,000	4,369,000
Income (loss) before income taxes	41,798,000	14,227,000
Total assets	1,566,030,000		1,493,851,000
Operating Segments [Member] | Reverse Mortgage [Member]
REVENUES
Total revenues	43,927,000	27,868,000
EXPENSES
Interest expense	1,099,000	859,000
Depreciation and amortization	1,968,000	2,432,000
Income (loss) before income taxes	(13,457,000)	(9,063,000)
Total assets	10,844,895,000		10,476,947,000
Operating Segments [Member] | Other Segments [Member]
REVENUES
Total revenues	3,293,000	1,314,000
EXPENSES
Interest expense	36,734,000	36,441,000
Depreciation and amortization	4,000	4,000
Income (loss) before income taxes	(27,347,000)	(42,575,000)
Total assets	1,272,536,000		1,256,971,000
Eliminations [Member]
REVENUES
Total revenues	(10,426,000)	(14,032,000)
EXPENSES
Interest expense	0	0
Depreciation and amortization	0	0
Income (loss) before income taxes	0	0
Total assets	$ (658,819,000)		$ (641,573,000)