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Accounts Receivable - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Amount billed but not received under retainage provisions in contracts $ 900 $ 2,500  
Retainage receivables on contracts minimum period 1 year    
Retainage receivables on contracts maximum period 2 years    
Provision for doubtful accounts $ 1,357 3,895 $ 848
Charge-offs 800 1,500 $ 300
Allowance for doubtful accounts 2,897 $ 4,156  
Contract Receivables [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Divestitures impacted amount on contract receivables 22,200    
Allowance for doubtful accounts $ 1,200