INVESTMENTS - Average Coupon Rate Percentage and the Average Days to Maturity of Debt (Detail)	Jun. 30, 2013	Dec. 31, 2012
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Average Coupon Rate	0.138%	0.305%
Average Term to Maturity	95 days	138 days
Corporate Bonds and Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Average Coupon Rate	2.634%	2.965%
Average Term to Maturity	342 days	112 days