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Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2016 | Nov. 04, 2015 | Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |
Percentage of ownership interest acquired | 100.00% |  | 100.00% |  |
Additional borrowing |  |  |  | $ 29,000 |
Operating Income (loss) |  |  | $ 136,931 | $ 6,425 |
General and Administrative |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisition related transaction expenses |  |  |  |  | $ 900
Revolving Credit Facility |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Additional borrowing | $ 181,000 |  |  |  |
PAY.ON |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total purchase price |  | $ 186,373 | 186,373 |  |
Revenue |  |  | 4,200 |  |
Operating Income (loss) |  |  | $ (3,300) |  |
PAY.ON | Restricted share awards (RSAs) [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Issuance of ACI common stock |  |  | 476,750 |  |
Fair value of shares on grant date | $ 11,300 |  | $ 11,300 |  |
Awards granted requisite service period |  |  | 2 years |  |
PAY.ON | Restricted share awards (RSAs) [Member] | Vest In Every Six Months |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Percentage of award vesting increment for every six month |  |  | 25.00% |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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