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Incentive Compensation Plan - Unvested Target Award (Detail) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding, beginning of the year, Shares 117,000 247,668 231,834
Granted, Shares 84,500 26,000 121,348
Vested, Shares (54,000) (151,668) (105,514)
Forfeited, Shares (10,000) (5,000) 0
Outstanding, end of the year, Shares 137,500 117,000 247,668
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding, beginning of the year, Shares 525,045 426,596 320,705
Granted, Shares 130,995 276,442 176,936
Vested, Shares (149,480) (171,637) (18,348)
Forfeited, Shares (9,957) (6,356) (52,697)
Outstanding, end of the year, Shares 496,603 525,045 426,596