Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Narrative) (Detail)

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Stock-Based Compensation (Narrative) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock based compensation $ 700   $ 600 $ 2,332 $ 2,057
Stock options granted, exercisable life       5 years  
Stock options vested period       3 years  
Stock options remainder vesting period       2 years  
Number of Shares Underlying Options, Granted       1,406,000  
Shares repurchased 0 114,985 0   0
Common stock repurchased, value       $ 572  
Restricted Stock          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of Shares Underlying Options, Granted       238,783  
Minimum          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock options vested period       2 years  
Maximum          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock options vested period       5 years