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Stock-Based Compensation - Phantom Unit Activity (Narratives) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Apr. 30, 2017
Mar. 31, 2017
Partnership Phantom Units    
Unrecognized compensation    
Expected unrecognized compensation cost related to unvested awards (in dollars)   $ 1.1
Weighted-average period over which the expected unrecognized compensation cost related to unvested stock options will be recognized   1 year 8 months 18 days
Subsequent Event | Exterran Partners, L.P. | Partnership Plan    
Stock-Based Compensation    
Maximum number of shares available under the Plan 2,000,000  
Subsequent Event | Exterran Partners, L.P. | Partnership Plan | Partnership Phantom Units | First anniversary vesting    
Stock-Based Compensation    
Vesting percentage 33.33%  
Subsequent Event | Exterran Partners, L.P. | Partnership Plan | Partnership Phantom Units | Second anniversary vesting    
Stock-Based Compensation    
Vesting percentage 33.33%  
Subsequent Event | Exterran Partners, L.P. | Partnership Plan | Partnership Phantom Units | Third anniversary vesting    
Stock-Based Compensation    
Vesting percentage 33.33%  
Vesting period 3 years