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Leases - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Jun. 30, 2019
Jan. 01, 2019
Other Assets, Noncurrent $ 10,157 $ 9,062  
Other Assets, Current 35,760 34,944  
Other Liabilities, Current 29,366 34,760  
Finance Lease, Right-of-Use Asset   $ 8,599  
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