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Segment Information - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Geographic Concentration Risk
Segment Reporting Information [Line Items]
Percentage of revenues	No other country outside the United Kingdom and the United States accounted for more than 10% of the Company's consolidated revenues during the three months ended June 30, 2015.	No country outside the United States accounted for more than 10% of the Company's consolidated revenues during the six months ended June 30, 2015 or the three and six months ended June 30, 2014.	No country outside the United States accounted for more than 10% of the Company's consolidated revenues during the six months ended June 30, 2015 or the three and six months ended June 30, 2014.	No country outside the United States accounted for more than 10% of the Company's consolidated revenues during the six months ended June 30, 2015 or the three and six months ended June 30, 2014.
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 six months ended June 30, 2015 and 2014.	No single customer accounted for more than 10% of the Company's consolidated revenues during the three and six months ended June 30, 2015 and 2014.	No single customer accounted for more than 10% of the Company's consolidated revenues during the three and six months ended June 30, 2015 and 2014.	No single customer accounted for more than 10% of the Company's consolidated revenues during the three and six months ended June 30, 2015 and 2014.
United Kingdom | Customer Concentration Risk
Segment Reporting Information [Line Items]
Percentage of revenues attributable to customers	12.70%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 275



-SubTopic 10



-Section 50



-Paragraph 18



-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592



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-Publisher FASB



-Name Accounting Standards Codification



-Topic 825



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-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611



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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 Accounting Standards Codification



-Topic 280



-SubTopic 10



-Section 50



-Paragraph 42



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