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Selected Segment Financial Data, Revenues and Operating Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 225,735 | $ 216,975 | $ 697,796 | $ 662,971
Depreciation and amortization expense | 25,553 | 24,983 | 76,772 | 75,838
Stock-based compensation expense | 8,084 | 10,794 | 22,724 | 33,812
Operating income (loss) | 11,423 | (9,353) | (23,397) | 100,787
Operating Segments [Member] | ACI On Premise [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 126,006 | 120,618 | 385,108 | 349,904
Depreciation and amortization expense | 3,321 | 3,616 | 9,915 | 10,961
Stock-based compensation expense | 1,869 | 1,770 | 4,984 | 5,222
Operating income (loss) | 59,947 | 47,523 | 181,161 | 120,718
Operating Segments [Member] | ACI On Demand [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 99,729 | 96,357 | 312,688 | 297,651
Depreciation and amortization expense | 8,576 | 7,308 | 25,973 | 21,665
Stock-based compensation expense | 1,865 | 1,766 | 4,973 | 5,209
Operating income (loss) | (11,683) | (8,089) | (39,740) | (28,653)
Corporate and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 15,416
Depreciation and amortization expense | 13,656 | 14,059 | 40,884 | 43,212
Stock-based compensation expense | 4,350 | 7,258 | 12,767 | 23,381
Operating income (loss) | $ (36,841) | $ (48,787) | $ (164,818) | $ 8,722

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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