Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |
1 Months Ended | 2 Months Ended | 3 Months Ended | 4 Months Ended | 5 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|---|---|---|---|
Aug. 08, 2017 |
Aug. 10, 2017 |
Jan. 31, 2017 |
Feb. 29, 2016 |
Oct. 31, 2017 |
Jun. 30, 2016 |
Jun. 30, 2017 |
Jun. 30, 2017 |
Jun. 30, 2016 |
Dec. 31, 2016 |
|
| Subsequent Event [Line Items] | ||||||||||
| Proceeds from issuance of common stock, net | $ 161,435 | $ 121,236 | ||||||||
| Number of shares issued | 17,290,000 | 17,290,000 | 15,158,000 | |||||||
| Cash distributions paid to stockholders | $ 21,091 | 16,757 | ||||||||
| Rental property acquired | $ 192,853 | $ 245,575 | ||||||||
| Distribution declared per share | $ 0.410 | $ 0.405 | $ 0.410 | $ 0.415 | ||||||
| Common stock, par value | $ 0.001 | $ 0.001 | $ 0.001 | |||||||
| Scenario, Forecast | ||||||||||
| Subsequent Event [Line Items] | ||||||||||
| Monthly distribution approved per membership unit | $ 0.415 | |||||||||
| Common stock, par value | $ 80.00 | |||||||||
| Subsequent Event | ||||||||||
| Subsequent Event [Line Items] | ||||||||||
| Proceeds from issuance of common stock, net | $ 21,001 | |||||||||
| Number of shares issued | 263,000 | |||||||||
| Cash distributions paid to stockholders | $ 7,635 | |||||||||
| Rental property acquired | $ 42,942 | |||||||||
| Distribution declared per share | $ 0.415 | |||||||||