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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

X

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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- Definition

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+ References

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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)
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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
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