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Segment Information - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 240,599 |  | $ 219,930 | $ 472,061 | $ 445,996
Operating income | (38,443) |  | $ (26,572) | (34,820) | 110,140
BHMI judgment and related fees and interest expense | 48,100 | $ 2,700 |  | 48,100 |
General and Administrative Expense [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
BHMI judgment and related fees and interest expense | $ 46,700 |  |  | $ 46,700 |
Geographic Concentration Risk |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Percentage of revenues during the three and six months ended June 30, 2017 and 2016 | No other country outside the United States and the United Kingdom accounted for more than 10% of the Company's consolidated revenues during the three months ended June 30, 2017. No other country outside the United States accounted for more than 10% of the Company's consolidated revenues during the six months ended June 30, 2017 or the three and six months ended June 30, 2016. |  |  | No other country outside the United States and the United Kingdom accounted for more than 10% of the Company's consolidated revenues during the three months ended June 30, 2017. No other country outside the United States accounted for more than 10% of the Company's consolidated revenues during the six months ended June 30, 2017 or the three and six months ended June 30, 2016. |
Customer Concentration Risk [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Percentage of revenues during the three and six months ended June 30, 2017 and 2016 | No single customer accounted for more than 10% of the Company's consolidated revenues during the three and six months ended June 30, 2017 and 2016. |  |  | No single customer accounted for more than 10% of the Company's consolidated revenues during the three and six months ended June 30, 2017 and 2016. |
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | United Kingdom [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Percentage of revenues attributable to customers | 11.40% |  |  |  |
Corporate and Other [Member] | Community Financial Services Products [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues |  |  |  |  | 15,400
Operating income |  |  |  |  | $ 152,200

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