STOCKHOLDERS' EQUITY - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Apr. 30, 2007
Restricted Stock, Restricted Stock Units, and Performance-Based Stock Units
Limited Partners' Capital Account [Line Items]
Stock-based compensation expense	$ 585	$ 706	$ 1,863	$ 1,785
Restricted Stock and Restricted Stock Unit
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation expense, weighted average period			1 year 8 months 4 days
Total fair value of other stock awards vested	50		$ 2,703
Unrecognized stock-based compensation expense	2,907		$ 2,907
Performance-Based Stock Units
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation expense, weighted average period			2 years 3 months
Stock Options
Limited Partners' Capital Account [Line Items]
Stock-based compensation expense	143	161	$ 435	478
Unrecognized stock-based compensation expense	782		$ 782
Unrecognized stock-based compensation expense, weighted average period			1 year 7 months 20 days
Amended and Restated 1997 Employee Stock Purchase Plan
Limited Partners' Capital Account [Line Items]
Stock-based compensation expense	28	$ 24	$ 79	$ 62
Non-Employee Director | Restricted Stock Awards
Limited Partners' Capital Account [Line Items]
Options vesting period			3 years
Minimum | 2006 Stock Incentive 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	$ 431		$ 431
Maximum | 2006 Stock Incentive Plan
Limited Partners' Capital Account [Line Items]
Options granted period			10 years
Options vesting period			4 years
Class A Common Stock | 2006 Stock Incentive Plan
Limited Partners' Capital Account [Line Items]
Common stock, authorized shares (in shares)					2,475,000
Number of shares available for future grant (in shares)	646,000		646,000