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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]          
Effective tax rate (as percent) (24.20%) 12.40% (24.30%) 31.30%  
Valuation allowance on carryforwards $ 3.3   $ 3.3   $ 1.2
Increase in valuation allowance     $ 2.1