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Segment Reporting (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 1,165,309	$ 827,729	$ 3,259,287	$ 2,013,164
OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	946,281	642,054	2,627,185	1,542,223
Travel trailers and fifth-wheels
Disaggregation of Revenue [Line Items]
Net sales	602,429	417,050	1,633,059	936,676
Motorhomes
Disaggregation of Revenue [Line Items]
Net sales	63,259	44,441	193,105	107,241
Adjacent industries OEMs
Disaggregation of Revenue [Line Items]
Net sales	280,593	180,563	801,021	498,306
Aftermarket Segment
Disaggregation of Revenue [Line Items]
Net sales	219,028	185,675	632,102	470,941
Chassis, chassis parts and slide-out mechanisms | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	351,837	253,182	948,135	586,985
Windows and doors | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	254,526	173,102	761,168	438,829
Furniture and mattresses | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	184,741	105,226	508,789	250,068
Axles and suspension solutions | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	68,120	42,708	184,092	103,450
Other | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	87,057	67,836	225,001	162,891
U.S.
Disaggregation of Revenue [Line Items]
Net sales	1,077,657	768,274	2,977,786	1,848,796
U.S. | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	873,091	588,764	2,391,813	1,392,997
U.S. | Travel trailers and fifth-wheels
Disaggregation of Revenue [Line Items]
Net sales	586,830	407,485	1,582,182	916,144
U.S. | Motorhomes
Disaggregation of Revenue [Line Items]
Net sales	39,679	29,707	118,872	70,126
U.S. | Adjacent industries OEMs
Disaggregation of Revenue [Line Items]
Net sales	246,582	151,572	690,759	406,727
U.S. | Aftermarket Segment
Disaggregation of Revenue [Line Items]
Net sales	204,566	179,510	585,973	455,799
International
Disaggregation of Revenue [Line Items]
Net sales	87,652	59,455	281,501	164,368
International | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	73,190	53,290	235,372	149,226
International | Travel trailers and fifth-wheels
Disaggregation of Revenue [Line Items]
Net sales	15,599	9,565	50,877	20,532
International | Motorhomes
Disaggregation of Revenue [Line Items]
Net sales	23,580	14,734	74,233	37,115
International | Adjacent industries OEMs
Disaggregation of Revenue [Line Items]
Net sales	34,011	28,991	110,262	91,579
International | Aftermarket Segment
Disaggregation of Revenue [Line Items]
Net sales	$ 14,462	$ 6,165	$ 46,129	$ 15,142

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