Related Party Transactions and Arrangements - Cost Sharing Arrangements (Details) - Spirit MTA REIT - Affiliated Entity - USD ($) $ in Thousands |
Jun. 30, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Related Party Transaction [Line Items] | ||
| Due from related parties | $ 100 | $ 100 |
| Due to related parties | $ 20 | $ 1,800 |