Equity Method Investments - Summary of ASV Financial Information (Detail) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
		Dec. 31, 2017	Jun. 30, 2018
Schedule Of Equity Method Investments [Line Items]
Net income attributable to the Company			$ (409)
ASV after transaction [Member]
Schedule Of Equity Method Investments [Line Items]
Net sales	[1]	$ 30,455
Gross profit	[1]	4,146
Net income	[1]	(796)
Net income attributable to the Company	[1],[2]	(169)
Amortization of FMV adjustment	[1]	(35)
Income recognized by the Company	[1]	$ (204)

[1] The Company's policy is to record our earnings based on a one quarter lag.

[2] Represents 21.22% of ASV’s loss for the quarter ended December 31, 2017.