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Face (par) amount of debt instrument at time of issuance.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Acquisition of supreme industries, Inc.- Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 27, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Business Combination, Acquisition Related Costs		$ 0	$ 8,704	$ 68	$ 8,704
Goodwill		311,044	313,626	311,044	313,626	$ 317,464	$ 148,367
Goodwill, Period Increase (Decrease)				1,500
Revenues		553,073	$ 425,098	1,657,082	1,223,717
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
Business Combination, Acquisition Related Costs				100	$ 8,700
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 161,200
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months						20,100
Finite-Lived Intangible Assets, Amortization Expense, Year Two						20,500
Finite-Lived Intangible Assets, Amortization Expense, Year Three						22,100
Finite-Lived Intangible Assets, Amortization Expense, Year Four						23,400
Finite-Lived Intangible Assets, Amortization Expense, Year Five						$ 18,900
Goodwill	167,714
Revenues		85,100		276,800
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		$ 200		$ 14,200
Class A and Class B [Member]
Payments to Acquire Businesses, Gross	360,400
Class A and Class B [Member] \| Supreme Industries Inc. [Member]
Payments to Acquire Businesses, Gross	$ 360,400