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Related Party Transactions - Schedule of Related Party Transactions (Detail) - Affiliated Entity [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Related Party Transaction [Line Items]        
Sales $ 3,259 $ 2,641 $ 9,361 $ 7,363
Purchases 372 302 1,207 901
Rent $ 257 $ 290 $ 829 $ 875