Fair Value Measurements - Additional Information (Detail) (USD $)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale investments, short-term	$ 132,000,000		$ 119,000,000
Available for sale investments, long-term	108,000,000		126,000,000
Gross unrealized gains	2,000,000		2,000,000
Gross unrealized losses	1,000,000		1,000,000
Notional amount of foreign currency derivatives	458,000,000
Net gains (losses) from foreign currency forward contracts	13,000,000	1,000,000
Foreign Exchange Forward Contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Foreign currency forward contracts, Assets	3,542,000
Foreign currency forward contracts, Liabilities			3,290,000
Balance held by majority-owned subsidiaries
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Time deposits held by company's majority-owned subsidiaries	$ 278,000,000		$ 274,000,000

Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

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Aggregate notional amount of foreign currency exchange rate derivatives. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

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Amount of deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

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