Contract Assets and Contract Liabilities - Summary of Contract Assets and Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Contract Assets: Accounts Receivable
Accounts receivable	$ 2,480	$ 491
Total Contract Assets	739	432
Contract Liabilities: Customer Deposits and Deferred Revenue
Customer deposits	1,494	575
Deferred revenue	2,500	0
Total Contract Liabilities	3,994	575
Asset Management [Member]
Contract Assets: Accounts Receivable
Accounts receivable	67	0
Contract Liabilities: Customer Deposits and Deferred Revenue
Deferred revenue	2,500	0
Real Estate Services [Member]
Contract Assets: Accounts Receivable
Accounts receivable	672	432
Homebuilding [Member]
Contract Liabilities: Customer Deposits and Deferred Revenue
Customer deposits	$ 1,494	$ 575