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Stock-Based Compensation (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Unrecognized compensation cost $ 3,243   $ 3,243  
Share-based compensation expense 469 542 1,694 1,207
Stock Options [Member]
       
Award vesting period     10 years  
Award service period (in years)     4 years  
Non-Vested Stock Options [Member]
       
Unrecognized compensation cost 0   0  
Restricted Stock Units (RSUs) [Member]
       
Unrecognized compensation cost $ 3,243   $ 3,243  
Award vesting period     3 years  
Unrecognized compensation cost, period of recognition     1 year 11 months 12 days  
2014 Plan [Member]
       
Number of shares originally reserved 2,000,000   2,000,000  
Number of shares available for grant 1,437,150   1,437,150  
Second Anniversary of Award Date [Member] | Stock Options [Member]
       
Percent of options vesting 50.00%   50.00%  
Second Anniversary of Award Date [Member] | Restricted Stock Units (RSUs) [Member]
       
Peer company review period (in years)     2 years  
Percentage of restricted stock units vesting     67.00%  
Second Anniversary of Award Date [Member] | Restricted Stock Units TSR [Member]
       
Peer company review period (in years)     2 years  
Percentage of restricted stock units vesting     67.00%  
Third Anniversary of Award Date [Member] | Stock Options [Member]
       
Percent of options vesting 25.00%   25.00%  
Third Anniversary of Award Date [Member] | Restricted Stock Units (RSUs) [Member]
       
Percentage of restricted stock units vesting     33.00%  
Third Anniversary of Award Date [Member] | Restricted Stock Units TSR [Member]
       
Percentage of restricted stock units vesting     33.00%  
Fourth Anniversary of Award Date [Member] | Stock Options [Member]
       
Percent of options vesting 25.00%   25.00%