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Major Clients (Details) - segment
3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2014
Major Clients Line Items        
Number of operating segments   1 1  
Customer concentration risk | Service Revenue | A        
Major Clients Line Items        
Concentration risk percentage 14.00% 13.00% 21.00% 16.00%
Customer concentration risk | Service Revenue | B        
Major Clients Line Items        
Concentration risk percentage 10.00%   15.00% 13.00%
Customer concentration risk | Service Revenue | C        
Major Clients Line Items        
Concentration risk percentage       12.00%