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RECEIVABLES (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Billed receivables:    
Trade and other receivables $ 374,691 $ 340,091
Less: Allowance for doubtful accounts (7,219) (4,832)
Net billed receivables 367,472 335,259
Unbilled receivables:    
Recoverable costs and estimated earnings not billed 158,006 149,847
Less: Progress payments applied (23,262) (22,044)
Net unbilled receivables 134,744 127,803
Receivables, net $ 502,216 $ 463,062