Segment Reporting (Schedule of Information Relating to Segments) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information
Net sales to external customers	$ 334,228	$ 345,296	$ 362,085	$ 361,457	$ 289,351	$ 294,271	$ 321,783	$ 285,377	$ 1,403,066	$ 1,190,782	$ 1,015,576	[1]
Operating profit (loss)									116,254	95,487	78,298	[2]
Total assets	622,946				543,841				622,946	543,841	453,184	[3]
Expenditures for long-lived assets									31,319	147,445	37,671	[4]
Depreciation and amortization									41,624	32,596	27,500
Purchase of long-lived assets as part of business acquisition									38,600	105,000	4,800
RV Segment
Segment Reporting Information
Net sales to external customers									1,284,928	1,074,448	893,694	[1]
Operating profit (loss)									107,485	86,571	68,248	[2]
Total assets	519,795				451,264				519,795	451,264	306,139	[3]
Expenditures for long-lived assets									30,126	145,406	34,989	[4]
Depreciation and amortization									$ 39,065	$ 29,933	$ 24,615
Consolidated net sales, percentage									92.00%	90.00%	88.00%
RV Segment | Thor Industries, Inc.
Segment Reporting Information
Consolidated net sales, percentage									29.00%	33.00%	34.00%
RV Segment | Berkshire Hathaway Inc.
Segment Reporting Information
Consolidated net sales, percentage									26.00%	28.00%	28.00%
RV Segment | Jayco, Inc.
Segment Reporting Information
Consolidated net sales, percentage									10.00%
Travel Trailer and Fifth Wheels
Segment Reporting Information
Net sales to external customers									$ 938,787	$ 841,497	$ 727,783
Motorhomes
Segment Reporting Information
Net sales to external customers									86,513	70,332	47,937
RV Aftermarket
Segment Reporting Information
Net sales to external customers									87,447	49,570	25,334
Adjacent Industries
Segment Reporting Information
Net sales to external customers									172,181	113,049	92,640
MH Segment
Segment Reporting Information
Net sales to external customers									118,138	116,334	121,882	[1]
Operating profit (loss)									12,485	10,870	11,926	[2]
Total assets	27,702				29,482				27,702	29,482	32,948	[3]
Expenditures for long-lived assets									1,193	2,039	2,682	[4]
Depreciation and amortization									$ 2,412	$ 2,568	$ 2,806
Consolidated net sales, percentage									8.00%	10.00%	12.00%
Manufactured Housing OEMs
Segment Reporting Information
Net sales to external customers									$ 82,032	$ 77,421	$ 80,245
Manufactured Housing Aftermarket
Segment Reporting Information
Net sales to external customers									15,559	14,186	13,719
Adjacent Industries
Segment Reporting Information
Net sales to external customers									20,547	24,727	27,918
Operating Segments
Segment Reporting Information
Net sales to external customers									1,403,066	1,190,782	1,015,576	[1]
Operating profit (loss)									119,970	97,441	80,174	[2]
Total assets	547,497				480,746				547,497	480,746	339,087	[3]
Expenditures for long-lived assets									31,319	147,445	37,671	[4]
Depreciation and amortization									41,477	32,501	27,421
Corporate and Other
Segment Reporting Information
Operating profit (loss)									(3,716)	(1,954)	(1,876)	[2]
Total assets	$ 75,449				$ 63,095				75,449	63,095	114,097	[3]
Depreciation and amortization									$ 147	$ 95	$ 79

[1] (a) Thor Industries, Inc., a customer of the RV Segment, accounted for 29 percent, 33 percent and 34 percent of the Company’s consolidated net sales for the years ended December 31, 2015, 2014 and 2013, respectively. Berkshire Hathaway Inc. (through its subsidiaries Forest River, Inc. and Clayton Homes, Inc.), a customer of both segments, accounted for 26 percent, 28 percent and 28 percent of the Company’s consolidated net sales for the years ended December 31, 2015, 2014 and 2013, respectively. Jayco, Inc., a customer of the RV Segment, accounted for 10 percent of the Company's consolidated net sales for the year ended December 31, 2015. No other customer accounted for more than 10 percent of consolidated net sales in the years ended December 31, 2015, 2014 and 2013.

[2] (b) Certain general and administrative expenses are allocated between the segments based upon net sales or operating profit, depending upon the nature of the expense.

[3] (c) Segment assets include accounts receivable, inventories, fixed assets, goodwill and other intangible assets. Corporate and other assets include cash and cash equivalents, prepaid expenses and other current assets, deferred taxes, and other assets.

[4] (d) Expenditures for long-lived assets include capital expenditures, as well as fixed assets, goodwill and other intangible assets purchased as part of the acquisition of businesses. The Company purchased $38.6 million, $105.0 million and $4.8 million of long-lived assets, as part of the acquisitions of businesses in the years ended December 31, 2015, 2014 and 2013, respectively.