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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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Revenues	$ 240,599	$ 219,930	$ 472,061	$ 445,996
Depreciation and amortization expense	25,581	24,343	51,219	50,855
Stock-based compensation expense	8,343	13,307	14,640	23,018
Operating income (loss)	(38,443)	(26,572)	(34,820)	110,140
Operating Segments [Member] | ACI On Premise [Member]
Segment Reporting Information [Line Items]
Revenues	127,194	117,246	259,102	229,286
Depreciation and amortization expense	3,333	3,430	6,594	7,345
Stock-based compensation expense	1,899	1,586	3,115	3,452
Operating income (loss)	57,296	37,614	121,214	73,195
Operating Segments [Member] | ACI On Demand [Member]
Segment Reporting Information [Line Items]
Revenues	113,405	102,684	212,959	201,294
Depreciation and amortization expense	9,009	6,935	17,397	14,357
Stock-based compensation expense	1,894	1,582	3,108	3,443
Operating income (loss)	(11,448)	(11,742)	(28,057)	(20,564)
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Revenues	0	0	0	15,416
Depreciation and amortization expense	13,239	13,978	27,228	29,153
Stock-based compensation expense	4,550	10,139	8,417	16,123
Operating income (loss)	$ (84,291)	$ (52,444)	$ (127,977)	$ 57,509

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

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+ 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)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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