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Other Comprehensive Income (loss) - Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]    
Beginning balance, Gains and Losses on Cash Flow Hedges $ (22,247)  
Other comprehensive income (loss) before reclassifications, Gains and Losses on Cash Flow Hedges 1,754 1,266
Amounts reclassified from accumulated other comprehensive income (loss), Gains and Losses on Cash Flow Hedges 118 53
Net current-period other comprehensive income, Gains and Losses on Cash Flow Hedges 1,872  
Ending balance, Gains and Losses on Cash Flow Hedges (20,375)  
Beginning balance, Foreign Currency Items (5,678)  
Other comprehensive income (loss) before reclassifications, Foreign Currency Items 1,917  
Amounts reclassified from accumulated other comprehensive income (loss), Foreign Currency Items 0  
Net current-period other comprehensive income, Foreign Currency Items 1,917  
Ending balance, Foreign Currency Items (3,761)  
Balance (27,925)  
Other comprehensive income (loss) before reclassifications 3,671  
Amounts reclassified from accumulated other comprehensive income (loss) 118  
Net current-period other comprehensive income 3,789  
Balance $ (24,136)