Equity - Additional Information (Details)				12 Months Ended
	Jan. 30, 2017	Oct. 04, 2016 USD ($)	Apr. 02, 2015 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) Director $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 $ / shares shares	Dec. 31, 2015 shares	Dec. 31, 2014 shares	Mar. 11, 2015 $ / shares
Class Of Stock [Line Items]
Dividends declared per common share | $ / shares				$ 0.63	$ 0.84	$ 0.63
Interest-only loan interest rate	9.60%
Restricted Stock
Class Of Stock [Line Items]
Granted | shares				46,788	115,030	88,915
Forfeited vested shares | shares				12,299
BlueMountain Capital Management LLC | Board of Directors | Restricted Stock
Class Of Stock [Line Items]
Number of directors designated | Director				2
Granted | shares							16,108	16,108
Forfeited vested shares | shares				10,740
Common stock repurchased and cancelled, shares | shares				5,368
Common stock repurchased and cancelled, value				$ 50,000
Repayment of dividends				$ 29,000
7.875% Series B Redeemable Cumulative Preferred Stock
Class Of Stock [Line Items]
Preferred stock dividend rate				7.875%
Liquidation preference per share | $ / shares				$ 1,000
7.875% Series B Redeemable Cumulative Preferred Stock | IPO
Class Of Stock [Line Items]
Preferred stock redemption amount		$ 131,300,000
Preferred stock special dividend redemption rate percentage		5.00%
Accrued and unpaid dividends		$ 900,000
Carter Validus | 7.875% Series B Redeemable Cumulative Preferred Stock
Class Of Stock [Line Items]
Preferred stock shares sold | shares			125,000
Preferred stock dividend rate			7.875%
Liquidation preference per share | $ / shares			$ 1,000						$ 1,000
Preferred stock gross proceeds			$ 125,000,000
Lakeway Partnership
Class Of Stock [Line Items]
Cash contribution				$ 2,000,000
Ownership percentage by parent				51.00%
Equity method investment ownership percentage				49.00%
Investment in subsidiary by noncontrolling interest				$ 1,000,000
Lakeway mortgage note receivable foreclosure				50,000,000
Additional cash contribution to acquire real estate				$ 23,000,000
Intercompany Mortgage Loan, term				10 years
Interest-only loan interest rate				8.00%
Intercompany Mortgage Loan, amortization schedule				25 years
Intercompany Mortgage Loan, outstanding principal balance				$ 69,600,000	$ 70,700,000
Lakeway Partnership | First Mortgage
Class Of Stock [Line Items]
Intercompany Mortgage Loan				$ 73,000,000