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STOCK BASED COMPENSATION - Restricted Stock Units Activity (Detail)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Number of Restricted Stock Units  
Non-vested at beginning of year | shares 71,451
Granted | shares 59,072
Forfeited | shares (17,850)
Non-vested at June 30, 2016 | shares 112,673
Weighted Average Grant Date Fair Value Per Share  
Non-vested at beginning of year | $ / shares $ 101.29
Granted | $ / shares 109.99
Forfeited | $ / shares 105.38
Non-vested at June 30, 2016 | $ / shares $ 105.21
Weighted Average Remaining Contractual Life  
Non-vested at June 30, 2016 2 years 11 months 1 day
Total Aggregate Intrinsic Value  
Non-vested at June 30, 2016 | $ $ 11,732