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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Related Party Transaction [Line Items]        
Sales $ 2,386 $ 1,573 $ 4,722 $ 3,100
Purchases 308 153 599 256
Rent $ 289 $ 154 $ 585 $ 309