Quarterly report pursuant to Section 13 or 15(d)

Earnings per Share - Computation of Basic and Diluted Earnings Per Share, Including Antidilutive Securities Excluded from Computation of Earnings Per Share (Parenthetical) (Detail)

v3.19.1
Earnings per Share - Computation of Basic and Diluted Earnings Per Share, Including Antidilutive Securities Excluded from Computation of Earnings Per Share (Parenthetical) (Detail) - Restricted Stock Awards [Member] - 2013 Omnibus Equity Incentive Plan [Member]
 3 Months Ended
Mar. 31, 2019
Minimum [Member]  
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]  
Vesting period 1 year
Maximum [Member]  
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]  
Vesting period 3 years