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Fair Value Measurements - Additional Disclosures (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Impairment of goodwill $ 37,180,000 $ 0 $ 37,180,000 $ 0  
Cash equivalents 0   0   $ 0
Asset impairment charges 0 $ 0 0 $ 0  
Energy Chemical Technologies          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Impairment of goodwill $ 37,200,000   $ 37,180,000