SHARE BASED COMPENSATION (Summary of Share Option Activity) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Number of Common Shares
Balance at January 1	108,503
Granted	12,941
Exercised	(17,362)	(21,694)
Forfeited or expired	(1,455)
Balance at December 31	102,627
Exercisable, Common Shares	51,309
Weighted Average Exercise Share Price
Balance at January 1	$ 22.46
Granted	42.48
Exercised	17.33
Forfeited or expired	26.6
Balance at December 31	25.8
Exercisable Weighted Average Exercise Price	20.96
Weighted average fair value of options granted during the year	$ 13.42	$ 7.75
Weighted Average Contractual Remaining Life(Years)
Balance at end of period	4 years 1 month 6 days
Exercisable at end of period	2 years 6 months
Balance at January 1	$ 1,902
Exercised	427
Balance at December 31	1,584
Exercisable, Intrinsic Value	$ 1,028