COMMON STOCK - Repurchase of Shares of Common Stock (Detail) (USD $)	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Equity [Abstract]
Number of Shares Repurchased and Canceled	198,728	527,243	685,990	421,060	540,390	74,820	1,411,961	1,036,270
Amount Paid for Repurchases	$ 23,173,000	$ 58,846,000	$ 78,340,000	$ 48,356,000	$ 59,015,000	$ 7,160,000	$ 160,359,000	$ 114,531,000	$ 163,700,000
Average Price Paid per Share	$ 116.60	$ 111.61	$ 114.20	$ 114.84	$ 109.21	$ 95.70	$ 113.57	$ 110.52
Stock Repurchased and Retired During Period, Shares, Not Yet Settled	29,100
Stock Repurchased and Retired During Period, Value, Not Yet Settled	$ 3,400,000