Investments - Summary of Unaudited Financial Information and Unaudited Financial Position of Joint Venture (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Operating results:
The Company's share of net (loss) income	$ (16)	$ (75)	$ 126	$ 153
Balance Sheet:
Other	11,461		11,461		$ 11,342
Total assets	1,029,253		1,029,253		670,064
Other liabilities	13,772		13,772		26,702
Total liabilities and stockholders' equity (or members' capital)	1,029,253		1,029,253		670,064
Investment in unconsolidated joint venture, at equity	1,664		1,664		2,102
Unconsolidated Joint Venture [Member]
Operating results:
Total revenues and gain		235	331	949
Total expenses	(18)	(318)	(83)	(801)
Net (loss) income	(18)	(83)	248	148
Balance Sheet:
Construction in progress - real estate	375		375		334
Property and equipment, net	1,213		1,213		1,654
Cash	110		110		179
Other	180		180		180
Total assets	1,878		1,878		2,347
Accounts payable	15		15		11
Other liabilities	14		14
Members' capital	1,849		1,849		2,336
Total liabilities and stockholders' equity (or members' capital)	1,878		1,878		$ 2,347
Operating Expense [Member]
Operating results:
The Company's share of net (loss) income	$ (16)	$ (75)	$ 126	$ 153