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Income Taxes - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Loss Carryforwards [Line Items]      
Reductions due to expiry of statute of limitations, gross $ 900,000    
Reductions due to expiry of statute of limitations may be recognized by the end of 2019 100,000    
Unrecognized tax benefits that would impact effective tax rate 700,000 $ 600,000 $ 400,000
Unrecognized tax benefits, income tax penalties and interest expense 0 100,000 0
Undistributed earnings of foreign subsidiaries 62,400,000 59,000,000 69,900,000
Deferred tax liability not recognized, amount of unrecognized deferred tax liability, undistributed earnings of foreign subsidiaries 600,000 300,000 200,000
Tax losses and tax credit carryforward, amount 81,000,000 92,700,000 82,400,000
Tax losses and tax credit carryforward, valuation allowance 15,000,000 15,000,000 15,900,000
U.K.      
Operating Loss Carryforwards [Line Items]      
Tax losses and tax credit carryforward, amount 38,800,000 43,400,000 35,300,000
Tax losses and tax credit carryforward, valuation allowance 4,100,000 4,600,000 4,100,000
Non-U.K.      
Operating Loss Carryforwards [Line Items]      
Tax losses and tax credit carryforward, amount 42,200,000 49,300,000 47,100,000
Tax losses and tax credit carryforward, valuation allowance 10,900,000 $ 10,400,000 $ 11,800,000
Tax Losses And Tax Credits Carryforward, Expire Between 2023 and 2034      
Operating Loss Carryforwards [Line Items]      
Tax losses and tax credit carryforward, amount 23,800,000    
Tax Losses And Tax Credits Carryforward, Indefinite      
Operating Loss Carryforwards [Line Items]      
Tax losses and tax credit carryforward, amount $ 57,200,000