STOCKHOLDERS EQUITY - Narrative (Detail) - USD ($)		12 Months Ended		25 Months Ended
	Jul. 01, 2011	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Nov. 18, 2020
Equity, Class of Treasury Stock [Line Items]
Common stock, shares authorized (in shares)		100,000,000	100,000,000	100,000,000
Common stock, par value (in dollars per share)		$ 1.00	$ 1.00	$ 1.00
Stock repurchased and retired (in shares)		820,328	668,191
Dividend Reinvestment Plan
Equity, Class of Treasury Stock [Line Items]
Additional dividends potential payment		$ 144,900,000
Due to related parties		$ 0	$ 0	$ 0
2020 Stock Repurchase Plan
Equity, Class of Treasury Stock [Line Items]
Repurchase of outstanding shares of common stock under Stock Repurchase Program		2,350,000		2,350,000
Common Stock | Director Plan
Equity, Class of Treasury Stock [Line Items]
Common stock, shares authorized (in shares)		45,000		45,000
Shares available for issuance (in shares)		24,424		24,424
Common Stock | Director Plan | Minimum
Equity, Class of Treasury Stock [Line Items]
Percentage of fee of annual retainer fee to purchase shares		50.00%		50.00%
Common Stock | Employee Stock Purchase Plan
Equity, Class of Treasury Stock [Line Items]
Common stock, shares authorized (in shares)	300,000
Maximum contribution amount	$ 25,000
Common Stock | Restated Employee Stock Purchase Plan
Equity, Class of Treasury Stock [Line Items]
Common stock, shares authorized (in shares)					700,000
Shares available for issuance (in shares)		707,153		707,153
Percentage of fair market value of share price		85.00%		85.00%
Common Stock | Restated Employee Stock Purchase Plan | Minimum
Equity, Class of Treasury Stock [Line Items]
Percentage of cash compensation paid through payroll deductions		1.00%		1.00%
Common Stock | Restated Employee Stock Purchase Plan | Maximum
Equity, Class of Treasury Stock [Line Items]
Percentage of cash compensation paid through payroll deductions		10.00%		10.00%
Common Stock | 2018 Stock Repurchase Plan
Equity, Class of Treasury Stock [Line Items]
Shares available for issuance (in shares)		1,800,000		1,800,000
Stock repurchased during period (in shares)		820,328
Stock repurchased during period		$ 25,700,000
Stock repurchased and retired (in shares)				1,488,519
Average cost per share (in dollars per share)				$ 33.58
Stock repurchased and retired				$ 50,000,000.0