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Share-Based Compensation - Summary of Option Activity (Detail) - Option Activity Under the 2003 Plan [Member]
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Schedule Of Stock Option Activity [Line Items]  
Option outstanding, Shares, Beginning balance | shares 66,000
Option granted, Shares | shares 0
Option Exercised, Shares | shares (25,990)
Option forfeited, Shares | shares (3,375)
Option outstanding, Shares, Ending balance | shares 36,635
Option Exercisable, Shares, Ending balance | shares 35,285
Option outstanding, Weighted Average Exercise Price, Beginning balance | $ / shares $ 7.38
Option Granted, Weighted Average Exercise Price | $ / shares 0
Option Exercised, Weighted Average Exercise Price | $ / shares 7.47
Option Forfeited, Weighted Average Exercise Price | $ / shares 8.22
Option Outstanding, Weighted Average Exercise Price, Ending balance | $ / shares 7.25
Option Exercisable, Weighted Average Exercise Price, Ending balance | $ / shares $ 7.11
Option Outstanding, Weighted Average Remaining Contractual Term 3 years 8 months 9 days
Option Exercisable, Weighted Average Remaining Contractual Term 3 years 7 months 17 days
Option outstanding, Aggregate Intrinsic Value | $ $ 760,345
Option Exercisable, Aggregate Intrinsic Value | $ $ 736,963