STOCK BASED COMPENSATION - Restricted Stock Units Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2014
Number of Units
Non-vested at beginning of year	70,457
Granted	16,084
Vested and released	(17,288)
Forfeited	(5,383)
Non-vested at March 31, 2014	63,870
Weighted Average Grant Date Fair Value
Non-vested at beginning of year	$ 88.32
Granted	$ 115.69
Vested and released	$ 85.00
Forfeited	$ 88.10
Non-vested at March 31, 2014	$ 96.13
Total Aggregate Intrinsic Value
Non-vested at March 31, 2014		$ 7,257