Investment Properties - Investment Properties (Detail) - USD ($) |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Real Estate Properties [Line Items] | ||
| Investment properties at cost | $ 251,469,575 | $ 136,441,226 |
| Land held for development | 12,353,963 | 6,846,918 |
| Less accumulated depreciation and amortization | (12,704,944) | (7,447,165) |
| Investment properties, net | 238,764,631 | 128,994,061 |
| Land [Member] | ||
| Real Estate Properties [Line Items] | ||
| Investment properties at cost | 50,777,143 | 32,171,097 |
| Buildings and Improvements [Member] | ||
| Real Estate Properties [Line Items] | ||
| Investment properties at cost | $ 188,338,469 | $ 97,423,211 |