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Goodwill and Intangible Assets - Schedule of Estimated Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]    
2018 $ 29,561  
2019 14,829  
2020 7,876  
2021 5,114  
2022 3,353  
Later years 6,361  
Total finite-lived intangible assets, net $ 67,094 $ 104,425