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Stock-Based Compensation - Summary of Activity for Options (Detail)
 12 Months Ended
Dec. 31, 2015
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Options, Outstanding - beginning of period 30,224
Options, Exercised (30,100)
Options, Forfeited or expired (124)
Options, Outstanding - end of period 0
Options, Exercisable at end of period 0
Weighted Average Exercise Price, Outstanding - beginning of period | $ / shares $ 19.67
Weighted Average Exercise Price, Exercised | $ / shares 19.68
Weighted Average Exercise Price, Forfeited or expired | $ / shares 18.16
Weighted Average Exercise Price, Exercisable at end of period | $ / shares $ 0