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Recently Adopted and Recently Issued Accounting Standards - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Undiscounted future minimum rent commitments under noncancellable leases $ 39,400   $ 39,400  
Additional discrete tax benefit 507 $ 721 1,869 $ 3,107
Net Cash Provided by (Used in) Financing Activities     (69,528) (142,909)
Accounting Standards Update 2016-09        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Additional discrete tax benefit     1,900 6,800
Accounting Standards Update 2016-16        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative-effect adjustment to retained earnings   5,915   5,915
Accounting Standards Update 2016-18        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net Cash Provided by (Used in) Financing Activities       400
Accounting Standards Update 2017-07        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Decrease in operating income $ 2,200 $ 1,600 $ 2,200 $ 1,600