Capital Stock - Additional Information (Detail) $ / shares in Units, $ in Thousands	1 Months Ended	2 Months Ended	6 Months Ended
	Feb. 28, 2018 shares	Mar. 31, 2018 $ / shares shares	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2018 $ / shares shares	Mar. 31, 2018 $ / shares	Dec. 31, 2017 shares
Class of Stock [Line Items]
Capital Stock Authorized			0	0		1
Capital Stock Issued			0	0		1
Capital Stock outstanding			0	0		1
Preferred stock, shares issued			7,794,042	7,794,042		0
Preferred stock, shares outstanding			7,794,042	7,794,042		0
Protective Provision [Member]
Class of Stock [Line Items]
Preferred stock, shares issued			1,000,000	1,000,000
Preferred stock, shares outstanding			1,000,000	1,000,000
Preferred Stock [Member]
Class of Stock [Line Items]
Stock issued during period, shares, new issues		7,794,042
Shares issued, price per share | (per share)		$ 7.10			$ 8.90
Preferred stock dividend rate			10.00%
Preferred stock dividends declared | $ / shares			$ 0
Preferred stock dividends cash paid | $ / shares			$ 0
Gross proceeds | $			$ 125,000
Conversion price | (per share)			$ 7.10	$ 8.90
Class 1 common stock [Member] | Privateer Holdings [Member]
Class of Stock [Line Items]
Stock issued during period, shares, in exchange of assets	75,000,000