SHARE BASED COMPENSATION (Summary of Share Option Activity) (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Number of Common Shares
Beginning balance	108,503
Granted	12,941
Exercised	(30,567)	(44,067)	(39,787)
Forfeited or expired	(3,577)
Ending balance	87,300	108,503
Exercisable, Common Shares	56,815
Weighted Average Exercise Share Price
Beginning balance	$ 22.46
Granted	42.48
Exercised	19.39
Forfeited or expired	30.07
Ending balance	26.22	$ 22.46
Exercisable Weighted Average Exercise Price	22.42
Weighted average fair value of options granted during the year	$ 13.42	$ 7.75	$ 7.63
Weighted Average Contractual Remaining Life(Years)
Balance at end of period	3 years 6 months
Exercisable at end of period	2 years 6 months
Beginning balance	$ 1,902
Exercised	669
Ending balance	1,160	$ 1,902
Exercisable, Intrinsic Value	$ 943