Capital Stock (Narrative) (Detail 1) - Rights Agreement shares in Thousands	Nov. 05, 2018 $ / shares shares
Capital Stock [Line Items]
Number of preferred stock authorized and declared as dividends | shares	1
Description of the number of preferred stock issued as dividend for each right issued	one one-thousandth
Series A Participating Cumulative Preferred Stock
Capital Stock [Line Items]
Par value of preferred stock (in dollars per share)	$ 2.50
Purchase price of the one one-thousandth of a share of preferred stock (in dollars per share)	$ 10.85
Minimum percentage of beneficial ownership acquired	4.99%
Minimum percentage increase in common stock beneficial ownership	0.50%