Quarterly report pursuant to Section 13 or 15(d)

Contracts Receivable Including Retainage, Net (Detail)

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Contracts Receivable Including Retainage, Net (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Contractors [Abstract]    
Contracts receivable $ 78,500 $ 104,541
Retainage 16,715 16,848
Contracts receivable including retainage, gross 95,215 121,389
Allowance for doubtful accounts (1,243) (1,098)
Contracts receivable including retainage, net $ 93,972 $ 120,291