|
Rollforward of Credit Losses Recognized in Earnings (Detail) (USD $)
In Thousands, unless otherwise specified |
6 Months Ended |
|---|---|
|
Jun. 30, 2011
|
|
| Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] | |
| Beginning Balance | $ 917 |
| Credit losses recorded | 39 |
| Reduction in credit losses due to redemptions | (71) |
| Ending Balance | $ 885 |