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Derivative Financial Instruments - Additional Information (Detail)
In Millions, unless otherwise specified
9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
USD ($)
Sep. 30, 2012
USD ($)
Sep. 30, 2013
AUD
Sep. 30, 2013
BRL
Sep. 30, 2013
GBP (£)
Sep. 30, 2013
MXN
Sep. 30, 2013
NOK
Sep. 30, 2013
FOREX contracts [Member]
Counterparty
Sep. 30, 2013
Reclassification out of Accumulated Other Comprehensive Income [Member]
USD ($)
Sep. 30, 2012
Reclassification out of Accumulated Other Comprehensive Income [Member]
USD ($)
Sep. 30, 2013
Reclassification out of Accumulated Other Comprehensive Income [Member]
USD ($)
Sep. 30, 2012
Reclassification out of Accumulated Other Comprehensive Income [Member]
USD ($)
Derivative Instruments And Hedging Activities [Line Items]                        
Notional amount of foreign currency contracts settled $ 233.9 $ 236.3                    
FOREX contracts outstanding in the aggregate notional amount 151.6   20.7 86.7 20.5 11.7 12.0          
Number of counterparties to FOREX contracts               2        
Net unrealized gains (losses) associated with FOREX contracts to be reclassified to earnings (1)                      
Amount reclassified from AOCGL due to the probability of a forecasted transaction not occurring                 $ 0 $ 0 $ 0 $ 0