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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%