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Leases - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Sep. 30, 2019
Jan. 01, 2019
Other Assets, Noncurrent $ 10,157 $ 11,589  
Other Assets, Current 35,760 32,955  
Other Liabilities, Current 29,366 41,576  
Finance Lease, Right-of-Use Asset   $ 7,691  
Accounting Standards Update 2016-02 [Member]      
Other Assets, Noncurrent     $ 44,900
Other Assets, Current     1,400
Other Liabilities, Current     1,000
Operating Lease, Liability     44,500
Finance Lease, Right-of-Use Asset 9,500   $ 58,700
Accounting Standards Update 2016-02 [Member] | Cost of Sales [Member]      
Finance Lease, Right-of-Use Asset, Amortization $ 32,000