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Segment Information Selected Segment Financial Data, Revenues and Operating Income (Loss) (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 |  |  |  |  |  |  |  |  | $ 1,009,780 | $ 1,024,191 | $ 1,005,701
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 97,350 | 102,224 | 103,454
Stock-based compensation expense |  |  |  |  |  |  |  |  | 20,360 | 13,683 | 43,613
Corporate and unallocated expenses |  |  |  |  |  |  |  |  | (92,296) | (144,715) | 58,633
Interest, net |  |  |  |  |  |  |  |  | (30,388) | (38,449) | (39,654)
Other, net | $ (688) | $ (1,304) | $ (1,677) | $ (55) | $ (443) | $ (1,059) | $ (1,766) | $ 649 | (3,724) | (2,619) | 4,105
Income before income taxes | $ 108,744 | $ 17,245 | $ (10,810) | $ (23,380) | $ 98,922 | $ 1,155 | $ (50,723) | $ (5,782) | 91,799 | 43,572 | 185,581
ACI On Premise [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 576,755 | 598,590 | 591,252
ACI On Demand [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 433,025 | 425,601 | 399,033
Operating Segments [Member] | ACI On Premise [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 576,755 | 598,590 | 591,252
Segment Adjusted EBITDA |  |  |  |  |  |  |  |  | 323,902 | 347,094 | 312,188
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 11,634 | 13,094 | 14,581
Stock-based compensation expense |  |  |  |  |  |  |  |  | 4,348 | 2,234 | 6,894
Operating Segments [Member] | ACI On Demand [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 433,025 | 425,601 | 399,033
Segment Adjusted EBITDA |  |  |  |  |  |  |  |  | 12,015 | (1,832) | (2,624)
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 31,541 | 34,171 | 29,385
Stock-based compensation expense |  |  |  |  |  |  |  |  | 4,338 | 2,230 | 6,876
Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 15,416
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 54,175 | 54,959 | 59,488
Stock-based compensation expense |  |  |  |  |  |  |  |  | $ 11,674 | $ 9,219 | $ 29,843

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