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RECEIVABLES (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Billed receivables:    
Trade and other receivables $ 415,681 $ 390,306
Less: Allowance for doubtful accounts (8,034) (7,436)
Net billed receivables 407,647 382,870
Unbilled receivables:    
Recoverable costs and estimated earnings not billed 245,805 225,810
Less: Progress payments applied (9,302) (14,925)
Net unbilled receivables 236,503 210,885
Receivables, net $ 644,150 $ 593,755