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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, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Opening balance, before-tax amount $ (207,373) $ (255,562) $ (163,756) $ (203,006)
Net gains (losses) reclassified into statement of income on completion of hedged transactions, before-tax amount (23,185) (15,813) (44,070) (22,654)
Changes in fair value of effective portion of outstanding derivatives, net, before-tax amount (75,420) 99,280 (139,922) 39,883
Gain (loss) on cash flow hedging derivatives, net, before-tax amount (52,235) 115,093 (95,852) 62,537
Closing balance, before-tax amount (259,608) (140,469) (259,608) (140,469)
Opening balance, tax (expense) or benefit 73,239 90,440 59,070 71,125
Net gains (losses) reclassified into statement of income on completion of hedged transactions, tax (expense) or benefit 8,759 5,390 17,061 7,643
Changes in fair value of effective portion of outstanding derivatives, net, tax (expense) or benefit 27,031 (35,676) 49,502 (14,108)
Gain (loss) on cash flow hedging derivatives, net, tax (expense) or benefit 18,272 (41,066) 32,441 (21,751)
Closing balance, tax (expense) or benefit 91,511 49,374 91,511 49,374
Opening balance, net of tax amount (134,134) (165,122) (104,686) (131,881)
Net gains (losses) reclassified into statement of income on completion of hedged transactions, net of tax amount (14,426) (10,423) (27,009) (15,011)
Changes in fair value of effective portion of outstanding derivatives, net, net of tax amount (48,389) 63,604 (90,420) 25,775
Gain (loss) on cash flow hedging derivatives, net of taxes amount (33,963) 74,027 (63,411) 40,786
Closing balance, net of tax amount $ (168,097) $ (91,095) $ (168,097) $ (91,095)