Selected Quarterly Results (unaudited) - Summary of the Company's Unaudited Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ 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 |
|
| Quarterly Financial Data [Abstract] | |||||||||||
| Total revenues | $ 49,472 | $ 46,235 | $ 43,671 | $ 42,185 | $ 39,449 | $ 37,010 | $ 34,823 | $ 31,587 | $ 181,563 | $ 142,869 | $ 98,086 |
| Total operating expenses | (26,284) | (26,827) | (22,026) | (21,544) | (21,927) | (20,133) | (21,056) | (16,115) | (96,681) | (79,231) | (55,703) |
| Operating income | 23,188 | 19,408 | 21,645 | 20,641 | 17,522 | 16,877 | 13,767 | 15,472 | 84,882 | 63,638 | 42,383 |
| Net income | 16,826 | 12,990 | 15,992 | 13,747 | 13,794 | 15,417 | 5,356 | 5,701 | 59,555 | 40,268 | 20,890 |
| Net income attributable to non-controlling interests | (1,296) | (1,042) | (1,265) | (1,153) | (1,314) | (1,459) | (538) | (603) | (4,756) | (3,914) | (1,603) |
| Net income attributable to Broadstone Net Lease, Inc. | $ 15,530 | $ 11,948 | $ 14,727 | $ 12,594 | $ 12,480 | $ 13,958 | $ 4,818 | $ 5,098 | $ 54,799 | $ 36,354 | $ 19,287 |
| Basic and diluted | $ 0.84 | $ 0.68 | $ 0.89 | $ 0.81 | $ 0.86 | $ 1.02 | $ 0.38 | $ 0.43 | $ 3.21 | $ 2.76 | $ 2.15 |
| Weighted average number of common shares outstanding | |||||||||||
| Basic | 18,515 | 17,617 | 16,623 | 15,582 | 14,497 | 13,647 | 12,766 | 11,802 | 17,084 | 13,178 | 8,989 |
| Diluted | 20,096 | 19,147 | 18,051 | 17,009 | 15,924 | 15,074 | 14,193 | 13,196 | 18,567 | 14,597 | 9,736 |