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STOCKHOLDERS' EQUITY - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Stock Options          
Limited Partners' Capital Account [Line Items]          
Stock-based compensation expense $ 176 $ 146 $ 347 $ 292  
Aggregate intrinsic value of options exercised 153   206    
Unrecognized stock-based compensation expense 771   771    
Restricted Stock, Restricted Stock Units, and Performance-Based Stock Units          
Limited Partners' Capital Account [Line Items]          
Stock-based compensation expense 1,441 729 2,499 1,278  
Restricted Stock and Restricted Stock Unit          
Limited Partners' Capital Account [Line Items]          
Total fair value of other stock awards vested 1,362   4,770    
Unrecognized stock-based compensation expense 4,437   $ 4,437    
Market-based Performance Stock Options          
Limited Partners' Capital Account [Line Items]          
Weighted average fair value (in dollars per share)     $ 12.51    
Risk free interest rate     1.45%    
Expected volatility     32.80%    
Dividend yield     0.00%    
Amended and Restated 1997 Employee Stock Purchase Plan          
Limited Partners' Capital Account [Line Items]          
Stock-based compensation expense 37 $ 26 $ 65 $ 52  
Non-Employee Director | Restricted Stock Awards          
Limited Partners' Capital Account [Line Items]          
Options vesting period     3 years    
Minimum | 2016 Plan          
Limited Partners' Capital Account [Line Items]          
Options vesting period     1 year    
Maximum | Performance-Based Stock Units          
Limited Partners' Capital Account [Line Items]          
Unrecognized stock-based compensation expense $ 6,980   $ 6,980    
Maximum | 2016 Plan          
Limited Partners' Capital Account [Line Items]          
Options granted period     10 years    
Options vesting period     4 years    
Weighted Average | Stock Options          
Limited Partners' Capital Account [Line Items]          
Unrecognized stock-based compensation expense, weighted average period     9 months    
Weighted Average | Restricted Stock and Restricted Stock Unit          
Limited Partners' Capital Account [Line Items]          
Unrecognized stock-based compensation expense, weighted average period     1 year 7 months 4 days    
Weighted Average | Performance-Based Stock Units          
Limited Partners' Capital Account [Line Items]          
Unrecognized stock-based compensation expense, weighted average period     2 years    
Class A Common Stock | 2016 Plan          
Limited Partners' Capital Account [Line Items]          
Common stock, authorized shares (in shares)         2,250,000
Number of shares available for future grant (in shares) 1,897,000   1,897,000    
Class A Common Stock | 2006 Incentive Plan          
Limited Partners' Capital Account [Line Items]          
Common stock, additional authorized shares (in shares)         2,723,000