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Assets Measured at Fair Value on Nonrecurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Financial Instruments and Fair Value [Line Items]
Impairment loss recorded	$ 800	$ 3,500	$ 600
Cost-method investments
Financial Instruments and Fair Value [Line Items]
Impairment loss recorded	753	2,685
Level 3 \| Cost-method investments
Financial Instruments and Fair Value [Line Items]
Cost-basis investments, at fair value	$ 1,640	$ 1,167

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investments accounted for under the cost method of accounting as of the balance sheet date.

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