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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, 2013
Dec. 31, 2012
Derivatives, Fair Value [Line Items]    
Current Portion of Derivative Assets $ 23,040 $ 31,669
Derivative Assets 69,797 148,581
Accrued Liabilities (22,022) (21,593)
Current Portion of Derivative Liabilities (143,999) (115,835)
Derivative Liabilities (299,570) (528,187)
Derivatives not designated as a cash flow hedge [Member] | Foreign currency contracts [Member]
    
Derivatives, Fair Value [Line Items]    
Current Portion of Derivative Assets 482 2,506
Derivative Assets 12 0
Accrued Liabilities 0 0
Current Portion of Derivative Liabilities (1,819) (60)
Derivative Liabilities (155) 0
Derivatives not designated as a cash flow hedge [Member] | Interest rate swap agreements [Member]
    
Derivatives, Fair Value [Line Items]    
Current Portion of Derivative Assets 21,779 16,927
Derivative Assets 69,785 144,247
Accrued Liabilities (22,025) (22,312)
Current Portion of Derivative Liabilities (140,503) (115,774)
Derivative Liabilities (248,091) (525,225)
Derivatives not designated as a cash flow hedge [Member] | Cross currency swap agreements [Member]
    
Derivatives, Fair Value [Line Items]    
Current Portion of Derivative Assets 779 11,795
Derivative Assets 0 4,334
Accrued Liabilities 3 719
Current Portion of Derivative Liabilities (1,677) 0
Derivative Liabilities (51,324) (2,962)
Derivatives designated as a cash flow hedge [Member] | Foreign currency contracts [Member]
    
Derivatives, Fair Value [Line Items]    
Current Portion of Derivative Assets   441
Derivative Assets   0
Accrued Liabilities   0
Current Portion of Derivative Liabilities   (1)
Derivative Liabilities   $ 0