Consolidated Balance Sheet (Unaudited) (Parenthetical)	Dec. 31, 2018 $ / shares shares
Common stock, par value (in dollars per share) | $ / shares	$ 0.01
Common stock, shares authorized (in shares)	750,000,000
Common stock, shares issued (in shares)	43,000,862
Common stock, shares outstanding (in shares)	43,000,862
SMTA Preferred Shares
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.01
Preferred stock, per share liquidation preference (in dollars per share) | $ / shares	$ 25
Preferred stock, shares authorized (in shares)	20,000,000
Preferred stock, shares issued (in shares)	6,000,000
Preferred stock, shares outstanding (in shares)	6,000,000
SubREIT Preferred Shares
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.01
Preferred stock, per share liquidation preference (in dollars per share) | $ / shares	$ 1,000
Preferred stock, shares authorized (in shares)	50,000,000
Preferred stock, shares issued (in shares)	5,125
Preferred stock, shares outstanding (in shares)	5,125