Real Estate and Lending Activities - Summary of Status Update on Current Development Projects (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Business Acquisition [Line Items]
Commitment	$ 70,084
Costs Incurred as of 06/30/2017	18,439
Ernest [Member] | Flagstaff [Member]
Business Acquisition [Line Items]
Commitment	28,067
Costs Incurred as of 06/30/2017	$ 11,351
Estimated Completion Date	1Q 2018
Circle [Member] | Birmingham [Member]
Business Acquisition [Line Items]
Commitment	$ 42,017
Costs Incurred as of 06/30/2017	$ 7,088
Estimated Completion Date	4Q 2018