• Filing Date: 2019-03-08
  • Form Type: 10-K
  • Description: Annual report
v3.10.0.1
Stock Based Compensation - Information with Respect to Unvested Restricted Stock Awards Stock Option and Incentive Plan (Detail) - Restricted Stock [Member] - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning balance, shares 597,690 542,503 620,513
Granted, Number of Restricted Stock Awards 189,860 154,936 142,440
Vested, Number of Restricted Stock Awards (98,617) (75,983) (47,152)
Cancelled, Number of Restricted Stock Awards     (160,000)
Forfeited, Number of Restricted Stock Awards (56,637) (23,766) (13,298)
Ending balance, shares 632,296 597,690 542,503
Nonvested, Weighted-Average Grant Date Fair Value, Beginning balance $ 32.82 $ 30.81 $ 30.33
Granted, Weighted-Average Grant Date Fair Value 41.81 42.92 32.35
Vested, Weighted-Average Grant Date Fair Value 40.82 37.95 42.27
Cancelled, Weighted-Average Grant Date Fair Value     26.27
Forfeited, Weighted-Average Grant Date Fair Value 36.46 36.32 39.06
Nonvested, Weighted-Average Grant Date Fair Value, Ending balance $ 33.33 $ 32.82 $ 30.81