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Purchase Price Allocation (Detail) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
Purchase Price Allocation (Detail) - USD ($) $ in Thousands	Sep. 27, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Goodwill		$ 311,044	$ 313,626	$ 317,464	$ 148,367
Acquisition, net of cash acquired		$ 0	$ 323,487
Supreme Industries Inc. [Member]
Cash	$ 36,878
Accounts receivable	25,196
Inventories	33,471
Prepaid expense and other	23,916
Property, plant, and equipment	59,891
Intangibles	161,200
Goodwill	167,714
Other assets	127
Total assets acquired	508,393
Current portion of long term debt	7,167
Accounts payable	10,546
Other accrued liabilites	55,518
Deferred income taxes	71,880
Long term liabilities	2,918
Total liabilities assumed	148,029
Net assets acquired	360,364
Acquisition, net of cash acquired	$ 323,486