Derivative Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	$ 7,389	$ 3,068	$ 45,183
Derivative liability, fair value	5,078	8,757	2,999
Designated As Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	7,389	3,068	32,841
Derivative liability, fair value	2,436	8,270	2,999
Designated As Hedging Instrument | Foreign Exchange Forward | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	7,389	3,064	32,277
Designated As Hedging Instrument | Foreign Exchange Forward | Other noncurrent assets
Derivatives, Fair Value [Line Items]
Derivative asset, fair value		4	564
Designated As Hedging Instrument | Foreign Exchange Forward | Accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	2,436	8,093	2,980
Designated As Hedging Instrument | Foreign Exchange Forward | Other noncurrent liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, fair value		177	19
Not Designated As Hedging Instrument | Foreign Exchange Forward | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, fair value			12,342
Not Designated As Hedging Instrument | Foreign Exchange Forward | Accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	$ 2,642	$ 487