Reverse Mortgage and Related Assets - Additional Information (Detail) (USD $)	3 Months Ended					0 Months Ended
	Mar. 31, 2014	Mar. 31, 2014 Zero collateral value [Member]	Mar. 31, 2014 Collateral Value Reduced by One Percent [Member]	Mar. 31, 2014 Maximum [Member]	Mar. 31, 2014 Minimum [Member]	Jul. 31, 2011 SASCO 2002-RM1's Class O Securities [Member] Mortgage-Backed Securities ("MBS") [Member]
Reverse Mortgage Loan Activities [Line Items]
Trading securities, par value						$ 2,500,000
Investments purchase percentage						100.00%
Income tax benefit	6,700,000
Consolidated mortgage investment	36,300,000
Average age of a mortgage backed securities borrower	92 years
Realizable collateral value of mortgage backed securities	60,500,000
Forecasted housing prices increase rate	2.50%
Forecasted housing prices increase rate, following year and thereafter	1.75%
Internal rate of return	15.55%
Cash payments to reverse mortgagors	7,900,000
Decrease in income	136,000	190,000
Reduction in collateral value	1.00%
Internal Rate of Return (IRR)		14.45%	14.77%
Net present value increase or decrease				$ 198,000	$ 197,000
Change in present value of IRR				1.00%	1.00%