Derivative Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	$ 19,571	$ 31,896	$ 9,765
Derivative liability, fair value	3,971	4,312	26,964
Designated As Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	19,571	31,896	6,371
Derivative liability, fair value	1,936	1,382	26,964
Designated As Hedging Instrument | Foreign Exchange Forward | Prepaid Expenses and Other Current Assets Classification
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	19,553	29,043	6,073
Designated As Hedging Instrument | Foreign Exchange Forward | Other Noncurrent Assets Classification
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	18	2,853	298
Designated As Hedging Instrument | Foreign Exchange Forward | Accrued Liabilities Classification
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	1,927	1,347	25,850
Designated As Hedging Instrument | Foreign Exchange Forward | Other Noncurrent Liabilities Classification
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	9	35	1,114
Not Designated As Hedging Instrument | Foreign Exchange Forward | Prepaid Expenses and Other Current Assets Classification
Derivatives, Fair Value [Line Items]
Derivative asset, fair value			3,394
Not Designated As Hedging Instrument | Foreign Exchange Forward | Accrued Liabilities Classification
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	$ 2,035	$ 2,930