Common Stock - Additional Information (Detail) - $ / shares	Dec. 31, 2018	Dec. 31, 2017	Sep. 05, 2017	Aug. 11, 2017
Equity [Abstract]
Common stock, shares issued	13,343,000	13,343,000	13,280,000	132,800,000
Common stock, shares authorized	30,000,000	20,000,000	20,000,000	200,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares outstanding	13,343,000	13,343,000	13,280,000	132,800,000