Derivative Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	$ 19,868	$ 31,896	$ 25,301
Derivative liability, fair value	11,743	4,312	10,954
Designated As Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	19,868	31,896	25,301
Derivative liability, fair value	8,922	1,382	1,884
Designated As Hedging Instrument | Foreign Exchange Forward | Prepaid Expenses and Other Current Assets Classification
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	19,403	29,043	17,248
Designated As Hedging Instrument | Foreign Exchange Forward | Other Noncurrent Assets Classification
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	465	2,853	8,053
Designated As Hedging Instrument | Foreign Exchange Forward | Accrued Liabilities Classification
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	8,528	1,347	1,842
Designated As Hedging Instrument | Foreign Exchange Forward | Other Noncurrent Liabilities Classification
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	394	35	42
Not Designated As Hedging Instrument | Foreign Exchange Forward | Accrued Liabilities Classification
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	$ 2,821	$ 2,930	$ 9,070