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Segment Information - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Segment Reporting Information [Line Items]
Number of geographic regions considered as reportable operating segments			3
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 months and six ended June 30, 2012 and 2011.	No single customer accounted for more than 10% of the Company's consolidated revenues during the three months and six ended June 30, 2012 and 2011.	No single customer accounted for more than 10% of the Company's consolidated revenues during the three months and six ended June 30, 2012 and 2011.	No single customer accounted for more than 10% of the Company's consolidated revenues during the three months and six ended June 30, 2012 and 2011.
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 six months ended June 30, 2012.		No other country outside the United States accounted for more than 10% of the Company's consolidated revenues during the three and six months ended June 30, 2012.
United Kingdom
Segment Reporting Information [Line Items]
Percentage of revenues		Aggregate revenues attributable to customers in the United Kingdom accounted for 11.2% and 13.0% of the Company's consolidated revenues during the three and six months ended June 30, 2011.		Aggregate revenues attributable to customers in the United Kingdom accounted for 11.2% and 13.0% of the Company's consolidated revenues during the three and six months ended June 30, 2011.

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

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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.

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