STOCK BASED COMPENSATION - Restricted Stock Units Activity (Detail) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($) $ / shares shares
Number of Units
Non-vested at beginning of year	63,600
Granted	10,624
Vested and released	0
Forfeited	(4,273)
Non-vested at September 30, 2015	69,951
Weighted Average Grant Date Fair Value Per Share
Non-vested at beginning of year | $ / shares	$ 96.04
Granted | $ / shares	130.40
Vested and released | $ / shares	0.00
Forfeited | $ / shares	101.20
Non-vested at September 30, 2015 | $ / shares	$ 100.94
Total Aggregate Intrinsic Value
Non-vested at September 30, 2015 | $	$ 9,745