CAPITAL STOCK AND STOCK AWARD PLANS Summary of Employee Stock Purchase Plan Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased by employees	228,103	231,564	259,730
Aggregate cost to employees	$ 13,045	$ 11,943	$ 12,928
Expense recognized by the company	57,661	47,861	9,094
Company expense on ESPP discount
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense recognized by the company	$ 2,269	$ 2,108	$ 2,281