Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Foreign Exchange Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total derivative (assets) liabilities	$ 3,104	$ (1,265)
Stock-Based Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total derivative (assets) liabilities	(16,943)	(11,934)
Quoted Prices in Active Markets for Identical Instruments Level (1) [Member] | Stock-Based Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total derivative (assets) liabilities	(16,943)	(11,934)
Significant Other Observable Inputs Level (2) [Member] | Foreign Exchange Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total derivative (assets) liabilities	3,104	(1,265)
Significant Unobservable Inputs Level (3) [Member] | Foreign Exchange Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total derivative (assets) liabilities
Significant Unobservable Inputs Level (3) [Member] | Stock-Based Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total derivative (assets) liabilities