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Cash Flow Hedges, Gains (Losses) Recorded as Component of Other Comprehensive Income (Loss) or Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Opening balance, before-tax amount $ (30,090) $ (66,786)
Net gains (losses) reclassified into statement of income upon completion of hedged transactions, before-tax amount (2,902) (9,254)
Changes in fair value of effective portion of outstanding derivatives, net, before-tax amount (79) 24,564
Gain (loss) on cash flow hedging derivatives, net, before-tax amount 2,823 33,818
Closing balance, before-tax amount (27,267) (32,968)
Opening balance, tax (expense) or benefit 9,830 23,646
Net gains (losses) reclassified into statement of income upon completion of hedged transactions, tax (expense) or benefit 702 3,251
Changes in fair value of effective portion of outstanding derivatives, net, tax (expense) or benefit (151) (8,734)
Gain (loss) on cash flow hedging derivatives, net, tax (expense) or benefit (853) (11,985)
Closing balance, tax (expense) or benefit 8,977 11,661
Opening balance, net of tax amount (20,260) (43,140)
Net gains (losses) reclassified into statement of income upon completion of hedged transactions, net of tax amount (2,200) (6,003)
Changes in fair value of effective portion of outstanding derivatives, net, net of tax amount (230) 15,830
Gain (loss) on cash flow hedging derivatives, net of taxes amount 1,970 21,833
Closing balance, net of tax amount $ (18,290) $ (21,307)