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Acquisition of supreme industries, Inc. - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Sep. 27, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 26, 2017
Debt Instrument, Face Amount		$ 557,233	$ 239,097
Business Combination, Acquisition Related Costs		9,605	0	$ 0
Goodwill		317,464	$ 148,367	$ 149,718
Goodwill, Period Increase (Decrease)		3,800
Senior Notes [Member]
Debt Instrument, Face Amount					$ 325,000
Debt Instrument, Interest Rate, Stated Percentage					5.50%
Supreme Industries Inc. [Member]
Business Acquisition, Share Price	$ 21
Goodwill	$ 169,235
Revenues		67,100
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		$ (1,600)
Class A and Class B [Member] | Supreme Industries Inc. [Member]
Payments to Acquire Businesses, Gross	$ 360,400

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