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Related Party Transactions - Schedule of Related Party Transactions (Detail) - Affiliated Entity [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Related Party Transaction [Line Items]        
Sales $ 3,209 $ 2,386 $ 6,102 $ 4,722
Purchases 472 308 835 599
Rent $ 291 $ 289 $ 572 $ 585