STOCK-BASED COMPENSATION PLANS - Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Options Outstanding
Outstanding, beginning of period (in shares)	1,147,558	1,232,862	1,465,678
Granted (in shares)	84,675	81,552	116,392
Exercised (in shares)	(124,156)	(163,786)	(344,806)
Canceled (in shares)	(10,754)	(3,070)	(4,402)
Outstanding, end of period (in shares)	1,097,323	1,147,558	1,232,862	1,465,678
Exercisable at December 31, 2015	863,157
Weighted-Average Exercise Price per Share
Outstanding, beginning of period (in dollars per share)	$ 28.33	$ 24.36	$ 20.24
Granted (in dollars per share)	87.35	73.20	48.29
Exercised (in dollars per share)	26.70	20.37	14.98
Canceled (in dollars per share)	65.22	52.73	26.61
Outstanding, end of period (in dollars per share)	32.70	$ 28.33	$ 24.36	$ 20.24
Exercisable at December 31, 2015	$ 23.71
Weighted-Average Remaining Contractual Life
Weighted- Average Remaining Contractual Life, outstanding	4 years 9 months 18 days	5 years 6 months	6 years 1 month 6 days	6 years 3 months 18 days
Weighted Average Remaining Contractual Life, Exercisable shares at December 31, 2015	4 years
Aggregate Intrinsic Value
Outstanding, beginning of period	$ 67,205	$ 61,530	$ 34,487
Granted	1,375	1,116	3,024
Exercised	(5,516)	(10,895)	(20,444)
Canceled	(64)	(105)	(210)
Outstanding, end of period	42,154	$ 67,205	$ 61,530	$ 34,487
Exercisable at December 31, 2014	$ 40,920