|
Gross Mortgage Loan Principal Outstanding and Allowance for Potential Future Losses (Detail) (USD $)
In Thousands, unless otherwise specified |
Sep. 30, 2012
|
Jun. 30, 2012
|
Dec. 31, 2011
|
|---|---|---|---|
| Mortgage Loans on Real Estate [Line Items] | |||
| Principal outstanding | $ 563,214 | $ 563,214 | $ 604,772 |
| Allowance for potential future losses | (2,442) | (2,849) | |
| Carrying value | $ 560,772 | $ 601,923 |