|
Increase or (Decrease) in Carrying Value of Investment in Life Insurance Policies (Detail) (USD $)
In Thousands, unless otherwise specified |
9 Months Ended | 12 Months Ended |
|---|---|---|
|
Sep. 30, 2012
|
Dec. 31, 2011
|
|
| Disclosure Increase Or Decrease In Carrying Value Of Investment In Life Insurance Policies [Abstract] | ||
| Life expectancy Plus 4 Months | $ (25,386) | $ (18,778) |
| Life expectancy Minus 4 Months | 28,250 | 20,785 |
| Discount Plus 1% | (17,167) | (13,802) |
| Discount Minus 1% | $ 20,030 | $ 15,804 |