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Segment Information - Additional Information (Detail) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010
Customer Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of revenues | No single customer accounted for more than 10% of the Company's consolidated revenues during the three and nine months ended September 30, 2011. | No single customer accounted for more than 10% of the Company's consolidated revenues during the three and nine months ended September 30, 2010. | No single customer accounted for more than 10% of the Company's consolidated revenues during the three and nine months ended September 30, 2011. | No single customer accounted for more than 10% of the Company's consolidated revenues during the three and nine months ended September 30, 2010.
Geographic Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of revenues |  | No other country outside the United States accounted for more than 10% of the Company's consolidated revenues during the three and nine months ended September 30, 2010. |  | No other country outside the United States accounted for more than 10% of the Company's consolidated revenues during the three and nine months ended September 30, 2010.
UNITED KINGDOM |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of aggregate revenue attributable to customers |  |  | 10.10% |

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- Definition Disclosure of the extent of enterprise reliance on its major customers. For example, includes revenues from transactions with a single external customer amounting to 10 percent or more of the entity's revenues, the total amount of revenues from each such customer, and the identity of the segment or segments reporting the revenues. A group of entities that the entity knows to be under common control generally will be considered a single customer for inclusion in this item. The federal government, a state government, a local government (for example, a county or municipality), or a foreign government each will generally be considered as a single customer for inclusion in this item. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 39 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + Details
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