CAPITAL STOCK AND STOCK AWARD PLANS Summary of Employee Stock Purchase Plan Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased by employees	231,564	259,730	248,405
Aggregate cost to employees	$ 11,943	$ 12,928	$ 13,116
Expense recognized by the company	47,861	9,094	59,381
Company expense on ESPP discount
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense recognized by the company	$ 2,108	$ 2,281	$ 2,315