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Earnings per Share - Reconciliation of Shares Outstanding for Basic and Diluted Earnings per Share (Detail) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]    
Weighted average shares outstanding 44,227 32,318
Less: Unallocated ESOP shares (290) (323)
Unallocated incentive award shares and shares held by deferred compensation plan (57) (94)
Average basic shares outstanding 43,880 31,901
Add: Effect of dilutive securities:    
Incentive awards and shares held by deferred compensation plan 966 1,189
Average diluted shares outstanding 44,846 33,090