Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share of Common Stock - Additional Information (Detail)

v3.19.1
Earnings Per Share of Common Stock - Additional Information (Detail) - shares
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Senior Common Stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive convertible shares of senior common stock excluded from calculation of diluted earnings per share 721,872 745,000