Schedule of Dividends Paid (Parenthetical) (Detail) - $ / shares		12 Months Ended
	Feb. 20, 2020	Dec. 31, 2019		Dec. 31, 2018
Equity [Abstract]
Cash dividend declared per share	$ 0.62	$ 2.48	[1]	$ 2.48	[1]

[1] On February 20, 2020, the Company declared a dividend of $0.62 per share for the second quarter of 2020. On April 2, 2020, the Company canceled its declared dividend for the second quarter of 2020.