Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share and Earnings Per Unit - Additional Information (Detail)

v3.19.1
Earnings Per Share and Earnings Per Unit - Additional Information (Detail) - shares
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Restricted Stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Securities not included in the effect of dilutive securities 73,770 118,062
Stock Options [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Securities not included in the effect of dilutive securities   11,000