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Selected Segment Financial Data, Revenues and Operating Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Revenues | $ 209,310 | $ 231,462
Stock-based compensation | (6,362) | (6,297)
Corporate and unallocated expenses | (20,014) | (25,830)
Interest, net | (6,621) | (10,054)
Other, net | (55) | 649
Loss before income taxes | (23,380) | (5,782)
Depreciation and amortization expense | 24,993 | 25,638
ACI On Premise [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 105,030 | 131,908
ACI On Demand [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 104,280 | 99,554
Operating Segments [Member] | ACI On Premise [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 105,030 | 131,908
Segment Adjusted EBITDA | 38,898 | 68,395
Depreciation and amortization expense | 2,975 | 3,261
Operating Segments [Member] | ACI On Demand [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 104,280 | 99,554
Segment Adjusted EBITDA | (4,233) | (7,007)
Depreciation and amortization expense | 7,736 | 8,388
Corporate and Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Depreciation and amortization expense | $ 14,282 | $ 13,989

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- Definition Segment Adjusted EBITDA is defined as earnings (loss) from operations before interest, income tax expense (benefit), depreciation and amortization adjusted to exclude stock-based compensation and net other income (expense). + References No definition available. + Details
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