Summary of Significant Accounting Policies - Schedule of Calculation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 27, 2018	Mar. 28, 2017
Numerator:
Net income attributable to controlling and non-controlling interests	$ 689	$ 2,702
Less: net income attributable to non-controlling interests	(35)	(904)
Net income attributable to The Habit Restaurants, Inc.	$ 654	$ 1,798
Class A Common Stock [Member]
Denominator: Weighted average shares of Class A common stock outstanding
Basic	20,439,253	20,188,687
Diluted	20,492,198	20,215,371
Net income attributable to The Habit Restaurants, Inc. per share Class A common stock
Basic	$ 0.03	$ 0.09
Diluted	$ 0.03	$ 0.09
Below is a reconciliation of basic and diluted share counts
Basic	20,439,253	20,188,687
Dilutive effect of stock options and restricted stock units	52,945	26,684
Diluted	20,492,198	20,215,371