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Other Assets - Summary of Other Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid project costs   $ 989
Deferred financing cost-line of credit   1,286
Bonds and escrow deposits $ 380 221
Other 905 846
Other assets, gross 1,285 3,342
Other Assets, accumulated amortization (669) (1,230)
Other assets $ 616 $ 2,112