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Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Nov. 04, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Business Acquisition [Line Items]
Percentage of ownership interest acquired	100.00%		100.00%		100.00%
Additional borrowing					$ 52,000	$ 112,000
Operating Income (loss)			$ (9,353)	$ 23,886	$ 100,787	$ 53,975
Restricted share awards (RSAs) [Member]
Business Acquisition [Line Items]
Issuance of ACI common stock					148,322
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			3,800		12,200
Operating Income (loss)			4,200		$ 12,200
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		$ 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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The total value of grants made during the period for equity awards other than options.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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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.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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