ISSUANCE AND REPURCHASE OF COMMON STOCK (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Nov. 30, 2013	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Nov. 28, 2016	Jun. 23, 2014
Equity, Class of Treasury Stock [Line Items]
Authorized amount							$ 150.0
Issuance of common stock, in shares				0	167,931
Net proceeds from sales under ATM Program					$ 6.0
Aggregate commissions paid, ATM Program					0.1
Capitalized stock issuance costs					0.7
Stock repurchase program, authorized amount								$ 50.0
Stock repurchased during period					$ 7.6	$ 21.1
Retirement of treasury stock, in shares					821,087
Stock repurchased and retired during period, value	$ 13.3
Purchase of treasury stock, in shares		0	0	0	274,110	546,977
Common Stock
Equity, Class of Treasury Stock [Line Items]
Retirement of treasury stock, value				$ 0.2
Additional Paid-in Capital
Equity, Class of Treasury Stock [Line Items]
Retirement of treasury stock, value				9.1
Retained Earnings
Equity, Class of Treasury Stock [Line Items]
Retirement of treasury stock, value				$ 19.4