Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Taxes:
REIT Taxable income distributed	100.00%
Income tax expense (benefit) attributable to TRSs	$ (329)	$ (76)	$ 648	$ (913)
Years federal and state tax returns remain open for examination			2013
Taxable REIT Subsidiary
Income Taxes:
Income tax expense (benefit) attributable to TRSs	$ (329)	$ (76)	$ 648	$ (913)