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Selected Segment Financial Data, Revenues and Operating Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 234,995 | $ 240,599 | $ 444,305 | $ 472,061
Stock-based compensation | (7,705) | (8,343) | (14,067) | (14,640)
Corporate and unallocated expenses | (21,498) | (66,500) | (41,512) | (92,330)
Interest, net | (6,975) | (10,514) | (13,596) | (20,568)
Other, net | (1,677) | (1,766) | (1,732) | (1,117)
Loss before income taxes | (10,810) | (50,723) | (34,190) | (56,505)
Depreciation and amortization expense | 24,351 | 25,581 | 49,344 | 51,219
ACI On Premise [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 121,395 | 127,194 | 226,425 | 259,102
ACI On Demand [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 113,600 | 113,405 | 217,880 | 212,959
Operating Segments [Member] | ACI On Premise [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 121,395 | 127,194 | 226,425 | 259,102
Segment Adjusted EBITDA | 54,760 | 62,527 | 93,658 | 130,922
Depreciation and amortization expense | 2,849 | 3,333 | 5,824 | 6,594
Operating Segments [Member] | ACI On Demand [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 113,600 | 113,405 | 217,880 | 212,959
Segment Adjusted EBITDA | (3,364) | (546) | (7,597) | (7,553)
Depreciation and amortization expense | 7,826 | 9,009 | 15,562 | 17,397
Corporate and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization expense | $ 13,676 | $ 13,239 | $ 27,958 | $ 27,228

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