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Selected Segment Financial Data, Revenues and Operating Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  |  | 102,224 | 103,454 |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  | 13,683 | 43,613 |  | 18,380
Operating income (loss) | $ 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
Operating Segments [Member] | ACI On Premise [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 598,590 | 591,252 |  | 589,006
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  |  | 13,094 | 14,581 |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  | 2,234 | 6,894 |  |
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | 331,766 | 290,713 |  |
Operating Segments [Member] | ACI On Demand [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 425,601 | 399,033 |  | 362,368
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  |  | 34,171 | 29,385 |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  | 2,230 | 6,876 |  |
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | (38,233) | (38,885) |  |
Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,416 |  | $ 94,603
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  |  | 54,959 | 59,488 |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  | 9,219 | 29,843 |  |
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | $ (208,893) | $ (30,698) |  |
[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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