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Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at Dec. 31, 2012     $ (27,925)  
Total other comprehensive loss (6,595) (35,052) (3,055) (29,606)
Balance at Jun. 30, 2013 (30,367)   (30,367)  
Gains and Losses on Cash Flow Hedges [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at Dec. 31, 2012     (22,247)  
Other comprehensive income (loss) before reclassifications     12,644  
Amounts reclassified from accumulated other comprehensive loss     236  
Total other comprehensive loss     12,880  
Balance at Jun. 30, 2013 (9,367)   (9,367)  
Foreign Currency Items [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at Dec. 31, 2012     (5,678)  
Other comprehensive income (loss) before reclassifications     (15,322)  
Amounts reclassified from accumulated other comprehensive loss     0  
Total other comprehensive loss     (15,322)  
Balance at Jun. 30, 2013 (21,000)   (21,000)  
Accumulated Other Comprehensive Loss [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at Dec. 31, 2012     (27,925)  
Other comprehensive income (loss) before reclassifications     (2,678)  
Amounts reclassified from accumulated other comprehensive loss     236  
Total other comprehensive loss     (2,442)  
Balance at Jun. 30, 2013 $ (30,367)   $ (30,367)