General form of registration statement for all companies including face-amount certificate companies

Effects of Foreign Currency Collar Designated as Cash Flow Hedges (Detail)

v2.4.0.8
Effects of Foreign Currency Collar Designated as Cash Flow Hedges (Detail) (Cash Flow Hedging, Foreign Currency Collar, USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Cash Flow Hedging | Foreign Currency Collar
          
Derivative Instruments, Gain (Loss) [Line Items]          
Gain (loss) recognized in other comprehensive income - effective portion $ 4,518 $ 5,156 $ 2,243 $ 5,156 $ 8,152