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RECEIVABLES (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Billed receivables:    
Trade and other receivables $ 378,350 $ 390,306
Less: Allowance for doubtful accounts (8,395) (7,436)
Net billed receivables 369,955 382,870
Unbilled receivables:    
Recoverable costs and estimated earnings not billed 234,286 225,810
Less: Progress payments applied (12,679) (14,925)
Net unbilled receivables 221,607 210,885
Receivables, net $ 591,562 $ 593,755