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Financial Instruments - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 Derivative | Jun. 30, 2013 | Jun. 30, 2012 Derivative | Dec. 31, 2012
Financial Instruments [Line Items] |  |  |  |  |
Financial instruments including money market funds maturities period |  |  | 90 days |  |
Maximum maturities period of long-term marketable securities |  |  | 3 years |  |
Minimum maturities period of long-term marketable securities |  |  | 1 year |  |
Maximum maturities period of short-term marketable securities |  |  | 12 months |  |
Minimum maturities period of short-term marketable securities |  |  | 90 days |  |
Material realized gains or losses related to sales of marketable securities | $ 0 | $ 0 | $ 0 | $ 0 |
Total fair value of marketable securities | 332,500,000 |  | 332,500,000 |  |
Total gross unrealized loss position |  |  | 1,200,000 |  |
Recognize impairment charges | 0 | 0 | 0 | 0 | 0
Investments in marketable securities | 0 |  | 0 |  | 0
Net gain related to forward contracts | 100,000 |  | 700,000 |  |
Derivative number of instruments entered into or settled during period |  | 0 |  | 0 |
Assets | 1,455,585,000 |  | 1,455,585,000 |  | 1,299,194,000
Liabilities | 603,626,000 |  | 603,626,000 |  | 572,226,000
Level 3 [Member] |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Assets | 0 |  | 0 |  | 0
Liabilities | $ 0 |  | $ 0 |  | $ 0

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