Annual report pursuant to Section 13 and 15(d)

Non-Controlling Interest - Additional Information (Detail)

v3.6.0.2
Non-Controlling Interest - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Noncontrolling Interest [Line Items]      
Exchange of operating partnership units to common stock 0 46,290  
Redemption of Operating Partnership units outstanding     131,093
Payment in cash for redemption of operating partnership units $ 0   $ 1,800,000
Maximum [Member]      
Noncontrolling Interest [Line Items]      
Outstanding OP units held by outside limited partners 1.00%