Stockholders' Equity - Rollforward - Additional Information (Details) - $ / shares	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Equity [Abstract]
Dividend distribution on common stock (in dollars per share)	$ 2.46	$ 2.46	$ 2.46	$ 2.28	$ 2.28	$ 2.28