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Segment Information - Additional Information (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) Segment | Dec. 31, 2016 USD ($) Segment | Dec. 31, 2015 USD ($) Segment
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 326,395 | $ 225,735 | $ 240,599 | $ 231,462 | $ 342,730 |  | $ 216,975 |  | $ 219,930 |  | $ 226,066 |  | $ 1,024,191 | $ 1,005,701 |  | $ 1,045,977
Operating income | $ 108,037 | $ 11,423 | $ (38,443) | 3,623 | $ 120,343 | [1] | $ (9,353) | [1] | $ (26,572) | [1] | $ 136,712 | [1] | 84,640 | $ 221,130 | [1] | $ 127,948
BHMI judgment and related fees and interest expense |  |  |  | $ 2,700 |  |  |  |  |  |  |  |  | $ 48,100 |  |  |
Number of geographic regions | Segment |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 3 |  | 3
BASE24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total revenues from licensing BASE24 product line |  |  |  |  |  |  |  |  |  |  |  |  | 19.00% | 22.00% |  | 21.00%
Digital Channels [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | $ 94,036 | $ 124,630 |  | $ 219,698
General and Administrative Expense [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BHMI judgment and related fees and interest expense |  |  |  |  |  |  |  |  |  |  |  |  | $ 46,700 |  |  |
Community Financial Services Products [Member] | Digital Channels [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,300 |  | $ 94,500
Geographic Concentration Risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of revenues during the years ended December 31, 2017, 2016, and 2015 |  |  |  |  |  |  |  |  |  |  |  |  | No other country outside the United States accounted for more than 10% of the Company's consolidated revenues during the years ended December 31, 2017, 2016, and 2015. |  |  |
Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of revenues during the years ended December 31, 2017, 2016, and 2015 |  |  |  |  |  |  |  |  |  |  |  |  | No single customer accounted for more than 10% of the Company's consolidated revenues during the years ended December 31, 2017, 2016, and 2015. |  |  |
Corporate and Other [Member] | Community Financial Services Products [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,400 |  |
Operating income |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 151,700 |  |
[1] | The Company adopted ASU 2016-09, Compensation - Stock Compensation: Improvements to Employee Share-Based Payment Accounting, ("ASU 2016-09") during the year ended December 31, 2016. The Company elected to early adopt ASU 2016-09 in the third quarter of 2016, which requires it to reflect any adjustments as of January 1, 2016, the beginning of the annual period that includes the interim period of adoption. The impact of the adoption to the Company's previously reported quarterly results for the quarters ended March 31 and June 30, 2016 are reflected in the table above.

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