Schedule of Fair Value of Marketable Securities and Foreign Currency Contracts (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed income available-for-sale securities	$ 211,151	[1]
Foreign currency forward contracts, Assets	6,748	[2]
Foreign currency forward contracts, Liabilities	6,780	[3]
Quoted Prices in Active Markets for Identical Assets, Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed income available-for-sale securities	17,596	[1]
Foreign currency forward contracts, Assets		[2]
Foreign currency forward contracts, Liabilities		[3]
Significant Other Observable Inputs, Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed income available-for-sale securities	193,555	[1]
Foreign currency forward contracts, Assets	6,748	[2]
Foreign currency forward contracts, Liabilities	$ 6,780	[3]

[1] Included in cash and cash equivalents and short- and long-term investments on the Company’s Consolidated Balance Sheets.

[2] Included in short-term derivative asset as prepaid expenses and other current assets on the Company’s Consolidated Balance Sheets.

[3] Included in short-term derivative liability as other accrued liabilities on the Company’s Consolidated Balance Sheets.