COMMON STOCK AND TREASURY STOCK (Detail) - USD ($)	3 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Nov. 06, 2018	May 08, 2018	Mar. 13, 2018
Equity, Class of Treasury Stock [Line Items]
Value of total number of shares purchased	$ 206,315,000	$ 112,764,000			$ 34,493,000	$ 116,761,000
Common Stock
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased and retired (in shares)	2,287,975	1,238,163	586,924	757,219	602,192	2,148,832
Common stock repurchased, average price per share (in usd per share)	$ 90.17	$ 91.07	$ 70.11	$ 69.48
Value of total number of shares purchased	$ 2,000	$ 1,000	$ 41,100,000	$ 52,600,000		$ 2,000
Stock repurchase cost incurred but not yet paid	6,000,000.0
Common Stock | March Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock									$ 200,000,000
Common Stock | May Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock								$ 200,000,000
Common Stock | November Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock							$ 200,000,000
Remaining authorization at the end of the period	$ 187,200,000