STOCK BASED COMPENSATION - Restricted Stock Units Activity (Detail) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) $ / shares shares
Number of Restricted Stock Units
Non-vested at beginning of year | shares	71,451
Granted | shares	53,267
Non-vested at March 31, 2016 | shares	124,718
Weighted Average Grant Date Fair Value Per Share
Non-vested at beginning of year | $ / shares	$ 101.29
Granted | $ / shares	111.12
Non-vested at March 31, 2016 | $ / shares	$ 105.57
Weighted Average Remaining Contractual Life
Non-vested at March 31, 2016	2 years 4 months 2 days
Total Aggregate Intrinsic Value
Non-vested at March 31, 2016 | $	$ 15,738