SEGMENT INFORMATION (Reconciliation) (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting [Abstract]
Total operating income	$ 97,047	$ 92,414	$ 263,621	$ 219,838
Interest expense	(7,949)	(10,457)	(25,719)	(31,584)
Other income, net	3,843	4,457	12,497	12,033
Earnings before income taxes	$ 92,941	$ 86,414	$ 250,399	$ 200,287

Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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Amount of the cost of borrowed funds accounted for as interest expense.

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The net result for the period of deducting operating expenses from operating revenues.

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Amount of income (expense) related to nonoperating activities, classified as other.

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