Earnings per Share - Summary of Components used in Calculation of Basic and Diluted Earnings per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Basic earnings:
Net earnings attributable to Broadstone Net Lease, Inc. common shareholders		$ 33,516	$ 21,214	$ 60,274	$ 43,437
Less earnings allocated to unvested restricted shares		(105)	(97)	(202)	(201)
Net earnings used to compute basic earnings per common share		33,411	21,117	60,072	43,236
Diluted earnings:
Net earnings used to compute basic earnings per share		33,411	21,117	60,072	43,236
Net earnings attributable to non-controlling interests		2,036	1,606	3,719	3,343
Net earnings used to compute diluted earnings per common share		$ 35,447	$ 22,723	$ 63,791	$ 46,579
Weighted Average Number of Common Shares Outstanding		169,933	146,506	167,072	146,089
Less weighted average unvested restricted shares	[1]	(378)	(387)	(374)	(361)
Weighted average number of common shares outstanding used in basic earnings per common share		169,555	146,119	166,698	145,728
Effect of restricted stock units	[2]	378	219	325	147
Effects of convertible membership units	[3]	10,323	11,092	10,323	11,240
Weighted average number of common shares outstanding used in diluted earnings per common share		180,256	157,430	177,346	157,115
Basic earnings per share		$ 0.20	$ 0.14	$ 0.36	$ 0.30
Diluted earnings per share		$ 0.20	$ 0.14	$ 0.36	$ 0.30

[1] Represents the weighted average effects of 391,187 and 378,516 unvested restricted shares of common stock as of June 30, 2022 and 2021, respectively, which will be excluded from the computation of earnings per share until they vest. The shares of restricted common stock were not included in the calculation of diluted earnings per share, as the effect of doing so would have been anti-dilutive.

[2] Represents the weighted average effects of shares of common stock to be issued as though the end of the period were the end of the performance period (see Note 15).

[3] Represents the weighted average effects of 10,323,206 and 10,481,872 OP Units outstanding at June 30, 2022 and 2021, respectively. OP Units are included in the diluted earnings per share calculation. However, because such OP Units would also require that the share of the net income attributable to such OP units also be added back to net income, there is no effect to EPS.