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Segment Information - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 319,950 | $ 245,525 | $ 234,995 | $ 209,310 | $ 326,395 | $ 225,735 | $ 240,599 | $ 231,462 | $ 1,009,780 | $ 1,024,191 | $ 1,005,701
Operating income | $ 116,414 | $ 28,359 | $ (2,158) | $ (16,704) | $ 108,037 | $ 11,423 | $ (38,443) | $ 3,623 | $ 125,911 | 84,640 | 221,130
BHMI judgment and related fees |  |  |  |  |  |  |  |  |  | 48,100 |
General and Administrative Expense [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
BHMI judgment and related fees |  |  |  |  |  |  |  |  |  | $ 46,700 |
Community Financial Services Products [Member] | Corporate, Non-Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 15,400
Operating income |  |  |  |  |  |  |  |  |  |  | $ 151,700
Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Description of customer revenue accounted for more than 10% of consolidated revenue |  |  |  |  |  |  |  |  | No single customer accounted for more than 10% of the Company’s consolidated revenues during the years ended December 31, 2018, 2017, and 2016. |  |
Geographic Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Description of customer revenue accounted for more than 10% of consolidated revenue |  |  |  |  |  |  |  |  | No other country outside the United States accounted for more than 10% of the Company’s consolidated revenues during the years ended December 31, 2018, 2017, and 2016. |  |

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