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Shared-Based Compensation - Reconciliation of Option Activity (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Number of options, Outstanding, Beginning Balance 1,034  
Number of Options, Granted 167 54,600
Number of Options, Exercised (145)  
Number of Options, Forfeited or expired (23)  
Number of Options, Outstanding, Ending Balance 1,033  
Number of Options, Options Exercisable 816  
Weighted-Average Exercise Price, Outstanding, Beginning Balance $ 12.09  
Weighted-Average Exercise Price, Granted 11.31  
Weighted-Average Exercise Price, Exercised 10.55  
Weighted-Average Exercise Price, Forfeited or expired 16.17  
Weighted-Average Exercise Price, Outstanding, Ending Balance 12.09  
Weighted-Average Exercise Price, Options exercisable $ 11.47  
Weighted-Average Remaining Contractual Term, Outstanding, Ending Balance 6 years 2 months 12 days  
Weighted- Average Remaining Contractual Term, Options exercisable 5 years 4 months 24 days  
Aggregate Intrinsic Value, Outstanding, Ending Balance [1] $ 3,073  
Aggregate Intrinsic Value, Options exercisable [1] $ 2,649  
[1] (1) The intrinsic value is the amount by which the market price of our stock was greater than the exercise price of any individual option grant at June 30, 2016.