Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015
Revenues:
Home sales	$ 279,885		$ 114,622		$ 96,929		$ 69,406		$ 261,668	$ 125,142	$ 78,836	$ 42,303	$ 560,842		$ 507,949	$ 280,209
Fee building, including management fees from unconsolidated joint ventures of $4,945, $8,202 and $12,426, respectively	44,217		43,309		47,181		55,617		60,781	52,761	30,028	42,937	190,324		186,507	149,890
Revenues													751,166		694,456	430,099
Cost of Sales:
Home sales	234,668		95,992		82,488		60,065		221,700	105,799	69,390	36,670	473,213		433,559	235,232
Home sales impairments	900		0		1,300		0		2,350	0	0	0	2,200		2,350	0
Land sale impairment									1,150	0	0	0	0		1,150	0
Fee building	43,194		41,808		45,899		53,926		58,040	50,832	28,317	40,914	184,827		178,103	139,677
Cost of Sales													660,240		615,162	374,909
Gross Margin:
Gross Profit Home Sales	44,317		18,630		13,141		9,341		37,618	19,343	9,446	5,633	85,429		72,040	44,977
Gross Profit Land Sales									(1,150)	0	0	0	0		(1,150)	0
Gross Profit Fee Building	1,023		1,501		1,282		1,691		2,741	1,929	1,711	2,023	5,497		8,404	10,213
Gross Margin													90,926		79,294	55,190
Expenses:
Selling and marketing expenses													(32,702)		(26,744)	(13,741)
General and administrative expenses													(26,330)		(25,882)	(20,278)
Equity in net income of unconsolidated joint ventures													866		7,691	13,767
Other income (expense), net													(229)		(409)	(1,027)
Pretax income	21,692		6,974		2,505		1,360		22,080	9,042	3,939	(1,111)	32,531		33,950	33,911
Provision for income taxes													(15,390)		(13,024)	(12,533)
Net income													17,141		20,926	21,378
Net loss attributable to noncontrolling interest													11		96	310
Net income attributable to The New Home Company Inc.	$ 10,471		$ 4,318		$ 1,517		$ 846		$ 13,780	$ 5,547	$ 2,509	$ (814)	$ 17,152		$ 21,022	$ 21,688
Earnings per share attributable to The New Home Company Inc.
Earnings Per Share, Basic	$ 0.50	[1]	$ 0.21	[1]	$ 0.07	[1]	$ 0.04	[1]	$ 0.67	$ 0.27	$ 0.12	$ (0.04)	$ 0.82	[1]	$ 1.02	$ 1.29
Earnings Per Share, Diluted	$ 0.50	[1]	$ 0.21	[1]	$ 0.07	[1]	$ 0.04	[1]	$ 0.66	$ 0.27	$ 0.12	$ (0.04)	$ 0.82	[1]	$ 1.01	$ 1.28
Weighted average number of shares outstanding
Basic (in shares)													20,849,736		20,685,386	16,767,513
Diluted (in shares)													20,995,498		20,791,445	16,941,088

[1] (1)Some amounts do not add to our full year results presented on our consolidated statement of operations due to rounding differences in quarterly and annual weighted average share calculations