COMMON STOCK - Repurchase of Shares of Common Stock (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Equity [Abstract]
Number of Shares Repurchased and Canceled	574,807	100,713	527,243	685,990	675,520	1,213,233
Amount for Repurchases	$ 77,390	$ 13,771	$ 58,846	$ 78,340	$ 91,161	$ 137,186	$ 194,066
Average Price Paid per Share	$ 134.64	$ 136.74	$ 111.61	$ 114.20	$ 134.95	$ 113.08
Stock Repurchased and Retired During Period, Shares, Not Yet Settled	44,850
Stock Repurchased and Retired During Period, Value, Not Yet Settled	$ 6,000