Stockholder's Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands					1 Months Ended	3 Months Ended		6 Months Ended
	May 31, 2019	Apr. 25, 2019	Mar. 25, 2019	Mar. 07, 2019	Mar. 31, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Class of Stock [Line Items]
Common stock, shares authorized						100,000		100,000		100,000
Common stock, par value						$ 0.01		$ 0.01		$ 0.01
Preferred stock, shares authorized						30,000,000		30,000,000		30,000,000
Preferred stock, par value						$ 0.0001		$ 0.0001		$ 0.0001
Common stock voting rights								Company’s common stock are entitled to one vote for each share of common stock held.
Common stock, shares issued						100		100		100
Common stock, shares outstanding						100		100		100
Contribution by stock holders	$ 40,000				$ 2,000	$ 40,003		$ 42,003
Common Stock, dividend declared per share						$ 54,150	$ 60,000	$ 335,150	$ 100,000
Common Stock [Member]
Class of Stock [Line Items]
Dividend payable, date declared		Apr. 25, 2019	Mar. 25, 2019	Mar. 07, 2019
Dividend payable, date to be paid		Apr. 25, 2019	Mar. 25, 2019	Mar. 07, 2019
Common Stock, dividend declared per share		$ 54,150	$ 160,000	$ 121,000
Amended And Restated Certificate Of Incorporation [Member]
Class of Stock [Line Items]
Capital stock, shares authorized						150,100,000		150,100,000
Common stock, shares authorized						100,000		100,000
Common stock, par value						$ 0.01		$ 0.01
Preferred stock, shares authorized						150,000,000		150,000,000
Preferred stock, par value						$ 0.0001		$ 0.0001