Segment Information - Additional Information (Detail) - Segment	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2016
Segment Reporting Information [Line Items]
Number of geographic regions		3
Number of reportable segments		3
Customer Concentration Risk
Segment Reporting Information [Line Items]
Percentage of revenues during the three and six months ended June 30, 2016 and 2015		No single customer accounted for more than 10% of the Company's consolidated revenues during the three and six months ended June 30, 2016 and 2015.
Customer Concentration Risk | United Kingdom
Segment Reporting Information [Line Items]
Percentage of revenues attributable to customers	12.70%
Geographic Concentration Risk
Segment Reporting Information [Line Items]
Percentage of revenues during the three and six months ended June 30, 2016 and 2015		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, 2016.