ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclass) (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Earnings before income taxes		$ 60,977	$ 41,162
Income tax		(17,334)	(8,615)
Net earnings		43,643	$ 32,547
Reclassification out of Accumulated Other Comprehensive Income [Member] | Total Pension and Postretirment Adjustments, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of prior service costs	[1]	227
Amortization of actuarial losses	[1]	(3,898)
Earnings before income taxes		(3,671)
Income tax		904
Net earnings		$ (2,767)

[1] These items are included in the computation of net periodic pension cost. See Note 9, Pension and Other Postretirement Benefit Plans.