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STOCK BASED COMPENSATION - Restricted Stock Units Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Total aggregate intrinsic value of outstanding units $ 8,441 $ 8,337 $ 8,185
Per share fair value of units granted (in dollars per share) $ 114.27 $ 115.67 $ 96.40
Number of Units      
Non-vested at beginning of year 63,600    
Granted 12,124    
Forfeited (4,273)    
Non-vested at December 31, 2015 71,451 63,600  
Weighted Average Grant Date Fair Value Per Share      
Non-vested at beginning of year $ 96.04    
Granted 114.27 $ 115.67 $ 96.40
Forfeited 101.20    
Non-vested at December 31, 2015 $ 101.29 $ 96.04