v3.10.0.1
Summary of Significant Accounting Policies - Cumulative Effect of Topic 606 Adoption (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Number of days which invoices are required to be paid 30 days    
Current assets:      
Accounts receivable, net $ 107,464   $ 101,012
Inventories 37,076   34,345
Current liabilities:      
Accounts payable 74,243   49,992
Long-term liabilities:      
Deferred tax liability 276,535   267,771
Stockholders’ equity:      
Retained earnings 259,534   208,279
Non-controlling interest $ 347,067   $ 342,240
Calculated under Revenue Guidance in Effect before Topic 606      
Current assets:      
Accounts receivable, net   $ 102,012  
Inventories   33,814  
Current liabilities:      
Accounts payable   50,095  
Long-term liabilities:      
Deferred tax liability   267,854  
Stockholders’ equity:      
Retained earnings   208,477  
Non-controlling interest   342,325  
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606      
Current assets:      
Accounts receivable, net   1,000  
Inventories   (531)  
Current liabilities:      
Accounts payable   103  
Long-term liabilities:      
Deferred tax liability   83  
Stockholders’ equity:      
Retained earnings   198  
Non-controlling interest   $ 85