Computation of Earnings (Loss) Per Share - Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Numerator:
Net loss attributable to The New Home Company Inc.	$ (1,987)	$ (640)
Denominator:
Basic weighted-average shares outstanding	19,986,394	20,924,753
Stock options and unvested restricted stock units	0	0
Diluted weighted-average shares outstanding	19,986,394	20,924,753
Basic loss per share attributable to The New Home Company Inc.	$ (0.10)	$ (0.03)
Diluted loss per share attributable to The New Home Company Inc.	$ (0.10)	$ (0.03)
Antidilutive stock options and unvested restricted stock units not included in diluted earnings per share	1,451,485	1,371,973