v3.8.0.1
Supplemental Cash Flow Disclosures - Additional Information (Detail) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Supplemental Cash Flow Elements [Line Items]      
Interest paid $ 32,429 $ 28,147 $ 20,974
State income and franchise taxes paid 655 310 44
Issuance of shares of common stock $ 313,490 $ 275,782 $ 329,795
Issuance of membership units, number of units 161 97 793
Issuance of membership units in the operating company in exchange for property contributed in UPREIT transaction, value $ 12,913 $ 7,190 $ 57,583
Notes receivable 6,527 6,527  
Dividend declared and accrued but not yet paid 8,449 6,643  
Payments for tenant improvements 2,777 1,730  
Credit for rent in advance $ 8,649 2,367  
7.00% Loan Agreement      
Supplemental Cash Flow Elements [Line Items]      
Notes receivable   $ 3,700  
Manager      
Supplemental Cash Flow Elements [Line Items]      
Issuance of shares of common stock, shares     139
Issuance of shares of common stock     $ 10,000
Manager | Non-Voting Convertible Preferred Units      
Supplemental Cash Flow Elements [Line Items]      
Shares received in exchange of share issued     100
Distribution Reinvestment Plan      
Supplemental Cash Flow Elements [Line Items]      
Issuance of shares of common stock, shares 499 391 258
Common stock issued $ 38,848 $ 27,615 $ 18,046