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Revenue - Schedule of Construction Services Contracts Receivable (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]    
Billed on completed contracts and contracts in progress $ 159,829 $ 184,100
Other receivables 1,527 2,588
Contracts receivable, gross 161,356 186,688
Allowance for doubtful accounts (383) (439)
Contracts receivable, net $ 160,973 $ 186,249