Long-Term Investments - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Investment [Line Items]
Business acquisition, gain recognized			$ 300,000
Business acquisition, acquisition related costs			500,000
Eligibility to receive a royalty fee	1.00%
Royalty income, nonoperating	0	0	0
Carrying value of investment	$ 0
Maximum
Investment [Line Items]
Ownership percentage under Cost Method for Investments	3.00%

In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity.

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+ Details

- Definition

This element represents the aggregate carrying amount of all cost-method investments held by the Company. Generally, such investments do not have readily determinable fair values and are not required to be accounted for by the equity method. The carrying amount of such securities equates to cost, adjusted for other-than-temporary impairment. The cost method and lower-of-cost or market, an adaptation of the cost method, is generally followed for most investments in noncontrolled corporations, in some corporate joint ventures, and to a lesser extent in unconsolidated subsidiaries, particularly foreign.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Principles Board Opinion (APB)

-Number 18

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-Publisher FASB

-Name Accounting Standards Codification

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-Name Emerging Issues Task Force (EITF)

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+ Details