ISSUANCE AND REPURCHASE OF COMMON STOCK (Detail) $ in Thousands	3 Months Ended	12 Months Ended
	Nov. 30, 2013 USD ($)	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares	May 31, 2015 USD ($) shares	Nov. 28, 2016 USD ($)	Jun. 23, 2014 USD ($)
Equity, Class of Treasury Stock [Line Items]
At the Market Equity Offering, Authorized Amount					$ 150,000
Issuance of common stock, in shares | shares			167,931
Net proceeds from sales under ATM Program			$ 6,000
Aggregate commissions paid, ATM Program			100
Capitalized stock issuance costs			700
Stock repurchase program, authorized amount		$ 50,000				$ 50,000
Stock repurchased during period			$ 7,600	$ 21,100
Retirement of treasury stock, in shares | shares			821,087
Retirement of treasury stock, value			$ 0
Stock repurchased and retired during period, value	$ 13,300
Purchase of treasury stock, in shares | shares		0	274,110	546,977
Remaining stock available to repurchase		$ 7,900
Maximum Leverage Ratio - Stock Repurchases - General		2.50
Liquidity		$ 15,000
Maximum Total Leverage Ratio - Stock Repurchases Permitted But Subject to Overall Limit		4.00
Common Stock
Equity, Class of Treasury Stock [Line Items]
Issuance of common stock, in shares | shares			168,000
Retirement of treasury stock, in shares | shares			821,000
Retirement of treasury stock, value			$ 245
Additional Paid-in Capital
Equity, Class of Treasury Stock [Line Items]
Retirement of treasury stock, value			9,129
Retained Earnings
Equity, Class of Treasury Stock [Line Items]
Retirement of treasury stock, value			$ 19,357