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Equity - Shares Issued and Gross Proceeds (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |
Total redemptions (shares) | (3,297,240) |
Total shares outstanding (in shares) | 77,881,873 | 77,525,973
Class T |  |
Class of Stock [Line Items] |  |
Total redemptions (shares) | 0 |
Total shares outstanding (in shares) | 228,101 | 227,311
Class S |  |
Class of Stock [Line Items] |  |
Total redemptions (shares) | 0 |
Total shares outstanding (in shares) | 281 | 279
Class D |  |
Class of Stock [Line Items] |  |
Total redemptions (shares) | 0 |
Total shares outstanding (in shares) | 19,376 | 19,268
Class I |  |
Class of Stock [Line Items] |  |
Total redemptions (shares) | 0 |
Total shares outstanding (in shares) | 819,384 | 806,014
Class A |  |
Class of Stock [Line Items] |  |
Total redemptions (shares) | (1,528,918) |
Total shares outstanding (in shares) | 25,844,447 | 25,729,035
Class AA |  |
Class of Stock [Line Items] |  |
Total redemptions (shares) | (1,744,366) |
Total shares outstanding (in shares) | 49,990,960 | 49,768,687
Class AAA |  |
Class of Stock [Line Items] |  |
Total redemptions (shares) | (23,956) |
Total shares outstanding (in shares) | 979,324 | 975,379
IPO |  |
Class of Stock [Line Items] |  |
Gross proceeds received to date of shares issued | $ 733,987 |
Common stock, number of shares issued (in shares) | 73,694,264 |
IPO | Class T |  |
Class of Stock [Line Items] |  |
Gross proceeds received to date of shares issued | $ 2,245 |
Common stock, number of shares issued (in shares) | 224,647 |
IPO | Class S |  |
Class of Stock [Line Items] |  |
Gross proceeds received to date of shares issued | $ 3 |
Common stock, number of shares issued (in shares) | 264 |
IPO | Class D |  |
Class of Stock [Line Items] |  |
Gross proceeds received to date of shares issued | $ 182 |
Common stock, number of shares issued (in shares) | 18,921 |
IPO | Class I |  |
Class of Stock [Line Items] |  |
Gross proceeds received to date of shares issued | $ 7,538 |
Common stock, number of shares issued (in shares) | 786,573 |
IPO | Class A |  |
Class of Stock [Line Items] |  |
Gross proceeds received to date of shares issued | $ 240,780 |
Common stock, number of shares issued (in shares) | 24,199,764 |
IPO | Class AA |  |
Class of Stock [Line Items] |  |
Gross proceeds received to date of shares issued | $ 474,858 |
Common stock, number of shares issued (in shares) | 47,562,870 |
IPO | Class AAA |  |
Class of Stock [Line Items] |  |
Gross proceeds received to date of shares issued | $ 8,381 |
Common stock, number of shares issued (in shares) | 901,225 |
Distribution Reinvestment Plan |  |
Class of Stock [Line Items] |  |
Gross proceeds received to date of shares issued | $ 65,275 |
Common stock, number of shares issued (in shares) | 6,869,864 |
Distribution Reinvestment Plan | Class T |  |
Class of Stock [Line Items] |  |
Gross proceeds received to date of shares issued | $ 33 |
Common stock, number of shares issued (in shares) | 3,454 |
Distribution Reinvestment Plan | Class S |  |
Class of Stock [Line Items] |  |
Gross proceeds received to date of shares issued | $ 0 |
Common stock, number of shares issued (in shares) | 17 |
Distribution Reinvestment Plan | Class D |  |
Class of Stock [Line Items] |  |
Gross proceeds received to date of shares issued | $ 4 |
Common stock, number of shares issued (in shares) | 455 |
Distribution Reinvestment Plan | Class I |  |
Class of Stock [Line Items] |  |
Gross proceeds received to date of shares issued | $ 215 |
Common stock, number of shares issued (in shares) | 22,311 |
Distribution Reinvestment Plan | Class A |  |
Class of Stock [Line Items] |  |
Gross proceeds received to date of shares issued | $ 27,645 |
Common stock, number of shares issued (in shares) | 2,909,959 |
Distribution Reinvestment Plan | Class AA |  |
Class of Stock [Line Items] |  |
Gross proceeds received to date of shares issued | $ 36,795 |
Common stock, number of shares issued (in shares) | 3,872,290 |
Distribution Reinvestment Plan | Class AAA |  |
Class of Stock [Line Items] |  |
Gross proceeds received to date of shares issued | $ 583 |
Common stock, number of shares issued (in shares) | 61,378 |
Share Distribution |  |
Class of Stock [Line Items] |  |
Common stock, number of shares issued (in shares) | 568,485 |
Share Distribution | Class T |  |
Class of Stock [Line Items] |  |
Common stock, number of shares issued (in shares) | 0 |
Share Distribution | Class S |  |
Class of Stock [Line Items] |  |
Common stock, number of shares issued (in shares) | 0 |
Share Distribution | Class D |  |
Class of Stock [Line Items] |  |
Common stock, number of shares issued (in shares) | 0 |
Share Distribution | Class I |  |
Class of Stock [Line Items] |  |
Common stock, number of shares issued (in shares) | 0 |
Share Distribution | Class A |  |
Class of Stock [Line Items] |  |
Common stock, number of shares issued (in shares) | 263,642 |
Share Distribution | Class AA |  |
Class of Stock [Line Items] |  |
Common stock, number of shares issued (in shares) | 300,166 |
Share Distribution | Class AAA |  |
Class of Stock [Line Items] |  |
Common stock, number of shares issued (in shares) | 4,677 |
Restricted stock units issued |  |
Class of Stock [Line Items] |  |
Common stock, number of shares issued (in shares) | 46,500 |
Restricted stock units issued | Class T |  |
Class of Stock [Line Items] |  |
Common stock, number of shares issued (in shares) | 0 |
Restricted stock units issued | Class S |  |
Class of Stock [Line Items] |  |
Common stock, number of shares issued (in shares) | 0 |
Restricted stock units issued | Class D |  |
Class of Stock [Line Items] |  |
Common stock, number of shares issued (in shares) | 0 |
Restricted stock units issued | Class I |  |
Class of Stock [Line Items] |  |
Common stock, number of shares issued (in shares) | 10,500 |
Restricted stock units issued | Class A |  |
Class of Stock [Line Items] |  |
Common stock, number of shares issued (in shares) | 0 |
Restricted stock units issued | Class AA |  |
Class of Stock [Line Items] |  |
Common stock, number of shares issued (in shares) | 0 |
Restricted stock units issued | Class AAA |  |
Class of Stock [Line Items] |  |
Common stock, number of shares issued (in shares) | 36,000 |

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