Quarterly report pursuant to Section 13 or 15(d)

Contracts Receivable including Retainage, net - Schedule of Contracts Receivable Including Retainage, Net (Detail)

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Contracts Receivable including Retainage, net - Schedule of Contracts Receivable Including Retainage, Net (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Sep. 30, 2017
Receivables [Abstract]    
Contracts receivable $ 102,673 $ 109,538
Retainage 14,482 13,180
Contracts receivable including retainage, gross 117,155 122,718
Allowance for doubtful accounts (1,476) (1,734)
Contracts receivable including retainage, net $ 115,679 $ 120,984