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Income Taxes - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Dec. 22, 2017
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Tax Contingency [Line Items]            
U.S. federal income tax rate   21.00%   35.00% 21.00%  
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit)     $ 19,800,000      
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Transition Tax For Accumulated Foreign Earnings, Provisional Income Tax Expense (Benefit)     18,000,000      
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Provisional Income Tax Expense (Benefit)     1,800,000      
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Differences of Non-U.S. Subsidiaries Offset By Foreign Tax Credits $ 7,800,000          
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit) Adjustment During the Period         $ 0  
Effective income tax rate   (22.80%)   7.70% (22.70%) 3.20%
Significant tax benefit related to certain share-based payments   2.20%   34.40% 2.20% 24.20%
Insurance receivable (Note 19) and other noncurrent assets   $ 122,901,000 $ 131,790,000   $ 122,901,000  
Accrued interest and penalties related to uncertain tax positions   2,800,000     2,800,000  
Other Noncurrent Liabilities            
Income Tax Contingency [Line Items]            
Unrecognized tax benefits   14,600,000     14,600,000  
Deferred Tax Asset            
Income Tax Contingency [Line Items]            
Insurance receivable (Note 19) and other noncurrent assets   $ 5,200,000     $ 5,200,000