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Shareholders' Equity - Reconciliation of Outstanding Balance of Stock Options (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Options, Outstanding at beginning 515 421
Options, Granted 100 200
Options, Exercised (102) (106)
Options, Forfeited or expired 0 0
Options, Outstanding at ending 513 515
Options, Exercisable at ending 305  
Options, Unvested at ending 208  
Weighted Average Exercise Price, Outstanding at beginning $ 25.13 $ 19.06
Weighted Average Exercise Price, Granted 29.55 30.50
Weighted Average Exercise Price, Exercised 12.38 11.17
Weighted Average Exercise Price, Forfeited or expired 0 0
Weighted Average Exercise Price, Outstanding at ending 28.52 25.13
Weighted Average Exercise Price, Exercisable at ending 27.46  
Weighted Average Exercise Price, Unvested at ending 30.08  
Weighted Average Grant Date Fair Value, Outstanding at beginning 11.64 9.01
Weighted Average Grant Date Fair Value, Granted 14.46 14.58
Weighted Average Grant Date Fair Value, Exercised 7.02 6.75
Weighted Average Grant Date Fair Value, Forfeited or expired 0 0
Weighted Average Grant Date Fair Value, Outstanding at ending $ 13.10 $ 11.64
Aggregate Intrinsic Value, Outstanding $ 46  
Aggregate Intrinsic Value, Exercisable 46  
Aggregate Intrinsic Value, Unvested $ 0