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Income (Loss) Per Share and Per Unit - Additional Information (Detail) - shares
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Earnings Per Share [Line Items]    
Number of non-committed, unearned ESOP shares 640,244 648,668
ESOP [Member]    
Earnings Per Share [Line Items]    
Number of ESOP units 0