Schedule of Activity in Real Estate Facilities (Detail)
9 Months Ended
Sep. 30, 2017
USD ($)
Real estate facilities  
Real estate facilities, beginning balance $ 727,455,733
Facility acquisitions 90,112,135
Impact of foreign exchange rate changes 8,636,972
Asset disposals (141,412)
Improvements and additions 3,266,246
Real estate facilities, ending balance 829,329,674
Accumulated depreciation  
Accumulated depreciation, beginning balance (14,855,188)
Asset disposals 141,412
Depreciation expense (14,756,893)
Impact of foreign exchange rate changes (212,694)
Accumulated depreciation, ending balance $ (29,683,363)