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Contract Assets - Schedule of Assets Related to Contracts with Customers (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Uncompleted supply, delivery, and installation (SDI) services contracts      
Aggregate construction costs incurred $ 17,516   $ 31,778
Aggregate net profit recognized 1,607   744
Less: Progress billings (17,663)   (32,360)
Assets recognised from costs to obtain or fulfil contracts with customers 1,460   162
Contract assets 1,460 $ 162  
Gross amounts due from customers for contract work-in-progress     162
Assets related to contracts with customers $ 1,460   $ 162