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Related Party Transactions - Transactions with Joint Ventures (Details) - USD ($) $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
May 31, 2017 | Apr. 13, 2016 | Dec. 07, 2012 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other (income) expense, net |  |  |  | $ 225 | $ 9 | $ (2,142) | $ (453) | $ (146) | $ (62) | $ (92) | $ (59) | $ (2,361) | $ (359) | $ (144) | $ 283
Corporate Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other (income) expense, net |  |  |  |  |  |  |  |  |  |  |  |  | $ 400 | 100 | $ (300)
Doosan-PSI, LLC | Corporate Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment amount with related party |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |
Percent of noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |
MAT-PSI Holdings, LLC | Green Power | Corporate Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Investment amount with related party |  |  | $ 900 |  |  |  |  |  |  |  |  |  |  |  |
Percent of noncontrolling interest |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
SW | Sterling And Wilson Cogen Solutions, LLC | Corporate Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment amount with related party | $ 200 | $ 200 |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of noncontrolling interest | 49.00% | 49.00% |  |  |  |  |  |  |  |  |  |  |  |  |

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