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Share-based Compensation - Summary of Company's Stock Option Plan Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Number of Shares, Options outstanding, Beginning balance 896
Number of Shares, Granted 309
Number of Shares, Exercised (145)
Number of Shares, Forfeited (17)
Number of Shares, Expired 0
Number of Shares, Options outstanding, Ending balance 1,043
Number of Shares, Options exercisable 585
Number of Shares, Available for grant 563
Weighted Average Price Per Share, Options outstanding, Beginning balance | $ / shares $ 11.63
Weighted Average Price Per Share, Granted | $ / shares 15.25
Weighted Average Price Per Share, Exercised | $ / shares 6.45
Weighted Average Price Per Share, Forfeited | $ / shares 15.96
Weighted Average Price Per Share, Expired | $ / shares 0
Weighted Average Price Per Share, Options outstanding, Ending balance | $ / shares 13.35
Weighted Average Price Per Share, Options exercisable | $ / shares $ 10.75
Weighted Average Remaining Contractual Life (Years), Options outstanding 5 years 6 months
Weighted Average Remaining Contractual Life (Years), Options exercisable 2 years 10 months 24 days
Aggregate Intrinsic Value, Options outstanding | $ $ 3,152
Aggregate Intrinsic Value, Options exercisable | $ $ 2,986