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Derivative Instruments and Hedging Activities - Location and Fair Value Amounts of Derivative Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Derivatives, Fair Value [Line Items]    
Current Portion of Derivative Assets $ 31,669 $ 24,712
Derivative Assets 148,581 140,557
Accrued Liabilities (21,593) (24,525)
Current Portion of Derivative Liabilities (115,835) (117,337)
Derivative Liabilities (528,187) (569,542)
Derivatives designated as a cash flow hedge [Member] | Foreign currency contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Current Portion of Derivative Assets 441 1,551
Derivative Assets   28
Current Portion of Derivative Liabilities (1) (1,192)
Derivative Liabilities   (264)
Derivatives not designated as a cash flow hedge [Member] | Foreign currency contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Current Portion of Derivative Assets 2,506 2,592
Derivative Assets   3
Current Portion of Derivative Liabilities (60) (6,248)
Derivative Liabilities   (832)
Derivatives not designated as a cash flow hedge [Member] | Interest rate swap agreements [Member]
   
Derivatives, Fair Value [Line Items]    
Current Portion of Derivative Assets 16,927 15,608
Derivative Assets 144,247 139,651
Accrued Liabilities (22,312) (24,750)
Current Portion of Derivative Liabilities (115,774) (109,897)
Derivative Liabilities (525,225) (568,446)
Derivatives not designated as a cash flow hedge [Member] | Cross currency swap agreements [Member]
   
Derivatives, Fair Value [Line Items]    
Current Portion of Derivative Assets 11,795 1,576
Derivative Assets 4,334 875
Accrued Liabilities 719 225
Derivative Liabilities (2,962)  
Derivatives not designated as a cash flow hedge [Member] | Foinaven embedded derivative [Member]
   
Derivatives, Fair Value [Line Items]    
Current Portion of Derivative Assets   $ 3,385