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

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

v2.4.0.8
Effects of Foreign Currency Options Designated as Cash Flow Hedges (Detail) (Cash Flow Hedging, Foreign Exchange Option, 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
Dec. 31, 2011
Dec. 31, 2010
Cash Flow Hedging | Foreign Exchange Option
              
Derivative Instruments, Gain (Loss) [Line Items]              
Loss recognized in other comprehensive income (loss) - effective portion         $ (19,428) $ (14,583) $ (1,125)
Gain (loss) recognized in other comprehensive loss - effective portion 1,179 (2,813) (3,174) (19,848)      
Gain (loss) recognized in other income (expense) - ineffective portion 13 (134) (307) (484) (864) (239) 20
Effect of derivative on consolidated financial statements         (20,292) (14,822) (1,105)
Amount reclassified from accumulated comprehensive income (loss) into depreciation and amortization expense $ 177   $ 294