PREFERRED STOCK - Repurchases of Depository Shares of Mandatory Convertible Preferred Stock (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2016
Equity [Abstract]
Number of Depository Shares Repurchased	105,000	265,000	65,000	435,000
Amount Paid for Repurchases	$ 6,647	$ 19,238	$ 5,025	$ 30,910
Average Price Paid per Share	$ 63.30	$ 72.60	$ 77.31	$ 71.06