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Shareholders' Equity Reconciliation of Weighted Average Number of Shares (Detail) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Equity [Abstract]        
Weighted average number of common shares outstanding 61,500 61,200 61,400 61,100
Director Plan and deferred stock units 200 200 200 200
ESOP 200 100 200 100
Common shares outstanding—basic 61,900 61,500 61,800 61,400
Dilutive effect of Omnibus Plan 900 800 0 800
Common and potential common shares outstanding—diluted 62,800 62,300 61,800 62,200