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Amount of debt securities categorized neither as held-to-maturity nor trading.

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Fair value before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Fair value before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Fair value as of the balance sheet date of all foreign currency derivative assets designated as cash flow hedging instruments.

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Fair value as of the balance sheet date of all foreign currency derivative liabilities designated as cash flow hedging instruments.

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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Assets:
Money market instruments	$ 520	$ 5,076
Financial assets at fair value	412,521
Corporate Bonds [Member]
Assets:
Financial assets at fair value	218,949
Asset-Backed Securities [Member]
Assets:
Financial assets at fair value	75,379
Treasury Bills [Member]
Assets:
Financial assets at fair value	73,666
Sovereign Bonds [Member]
Assets:
Financial assets at fair value	27,833
Municipal Bonds [Member]
Assets:
Financial assets at fair value	15,195
Agency Bonds [Member]
Assets:
Financial assets at fair value	1,499
Fair Value, Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets:
Money market instruments	520
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Corporate Bonds [Member]
Assets:
Financial assets at fair value	218,949
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Asset-Backed Securities [Member]
Assets:
Financial assets at fair value	75,379
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Treasury Bills [Member]
Assets:
Financial assets at fair value	73,666
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Sovereign Bonds [Member]
Assets:
Financial assets at fair value	27,833
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Municipal Bonds [Member]
Assets:
Financial assets at fair value	15,195
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Agency Bonds [Member]
Assets:
Financial assets at fair value	1,499
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Cash Flow Hedge Forward Contracts [Member]
Assets:
Hedge forward contracts, Assets	204
Liabilities:
Hedge forward contracts, Liabilities	98
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Economic Hedge Forward Contracts [Member]
Assets:
Hedge forward contracts, Assets	6
Liabilities:
Hedge forward contracts, Liabilities	$ 24