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Stock-Based Compensation - Analysis of Unvested Restricted Stock (Detail) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares      
Beginning Balance (in shares) 764,629 599,362 491,768
Grants (in shares) 171,974 177,493 169,870
Additional performance shares 118,812 179,415 106,084
Restriction lapses (in shares) (338,873) (191,641) (153,360)
Forfeitures (in shares) 0 0 (15,000)
Ending Balance (in shares) 716,542 764,629 599,362
Executive Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares      
Beginning Balance (in shares) 12,000 35,250 57,450
Grants (in shares) 0 0 0
Additional performance shares 0 0 0
Restriction lapses (in shares) (12,000) (23,250) (14,700)
Forfeitures (in shares) 0 0 (7,500)
Ending Balance (in shares) 0 12,000 35,250
Executive Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares      
Beginning Balance (in shares) 752,629 564,112 432,424
Grants (in shares) 156,500 159,000 153,000
Additional performance shares 118,812 179,415 106,084
Restriction lapses (in shares) (311,399) (149,898) (119,896)
Forfeitures (in shares) 0 0 (7,500)
Ending Balance (in shares) 716,542 752,629 564,112
Directors Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares      
Beginning Balance (in shares) 0 0 1,894
Grants (in shares) 8,840 10,805 9,135
Additional performance shares 0 0 0
Restriction lapses (in shares) (8,840) (10,805) (11,029)
Forfeitures (in shares) 0 0 0
Ending Balance (in shares) 0 0 0
Directors Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares      
Beginning Balance (in shares) 0 0 0
Grants (in shares) 6,634 7,688 7,735
Additional performance shares 0 0 0
Restriction lapses (in shares) (6,634) (7,688) (7,735)
Forfeitures (in shares) 0 0 0
Ending Balance (in shares) 0 0 0