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Stock-Based Compensation - Summary of Company's Stock Option Plan Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]                
Outstanding Beginning, Number of Options 230,000 230,000 230,000 280,000 230,000 280,000 280,000  
Outstanding, Weighted-Average Remaining Contractual Term 2 years 10 months 24 days 2 years 9 months 18 days 3 years 6 months 3 years 9 months 18 days     3 years 3 years 10 months 24 days
Exercised, Number of Options (80,000)     (50,000) (80,000) (50,000)    
Exercisable Ending, Weighted-Average Remaining Contractual Term 2 years 10 months 24 days   3 years 6 months          
Outstanding Ending, Number of Options 150,000 230,000 230,000 230,000 150,000 230,000 230,000 280,000
Outstanding Beginning, Weighted Average Exercise Price $ 3.00 $ 3.00 $ 3.00 $ 2.91 $ 3.00 $ 2.91 $ 2.91  
Exercisable Ending, Number of Options 150,000   230,000   150,000 230,000    
Exercised, Weighted-Average Exercise Price $ 2.50     2.50        
Outstanding Ending, Weighted-Average Exercise Price $ 3.26 $ 3.00 $ 3.00 $ 3.00 $ 3.26 $ 3.00 $ 3.00 $ 2.91
Outstanding Beginning, Aggregate Intrinsic Value $ 9,861 $ 9,256 $ 7,683 $ 14,166 $ 9,256 $ 14,166 $ 14,166  
Exercisable Ending , Weighted-Average Exercise Price $ 3.26   $ 3.00   $ 3.26 $ 3.00    
Outstanding Ending, Aggregate Intrinsic Value $ 6,142 $ 9,861 $ 8,649 $ 7,683 $ 6,142 $ 8,649 $ 9,256 $ 14,166
Exercisable Ending, Aggregate Intrinsic Value $ 6,142   $ 8,649   $ 6,142 $ 8,649