Stockholders' Equity (Detail)		1 Months Ended	7 Months Ended	12 Months Ended
	Jun. 04, 2018 $ / shares shares	Jun. 30, 2009 $ / shares shares	Dec. 31, 2018 shares	Dec. 31, 2019 vote class shares	Jun. 03, 2018 shares	Sep. 16, 2011 $ / shares shares	May 13, 2011
Class of Stock [Line Items]
Total stock dividend authorized to issue (in shares)				300,000,000	268,830,609
Number of classes of stock | class				3
Preferred stock, shares authorized (in shares)	100,000,000			100,000,000	100,000,000
Preferred shares outstanding (in shares)				0
Classes of preferred stock | class				1
2009 warrants
Class of Stock [Line Items]
Number of warrants issued (shares)		156,250
Exercisable price of warrants to purchase common stock (price per share) | $ / shares		$ 1.17
Warrants converted (in shares)					0
Number of warrants outstanding					40,057
Citadel Warrants
Class of Stock [Line Items]
Number of securities called by each warrant (in shares)					1
Number of warrants outstanding					31,955
Preferred stock, par/stated value (USD per share) | $ / shares						$ 0.01
Crestview Warrants
Class of Stock [Line Items]
Exercisable price of warrants to purchase common stock (price per share) | $ / shares						$ 34.56
Number of warrants outstanding					1,000,000.0	1,000,000
Class A Common Stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	100,000,000		100,000,000	100,000,000	93,750,000
Number of votes for each share | vote				1
Common stock, shares issued (in shares)	11,052,211		12,995,080	15,750,097
Class A Common Stock | Citadel Acquisition | Citadel Warrants
Class of Stock [Line Items]
Common stock, shares issued (in shares)						9,000,000
Class B Common Stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	100,000,000		100,000,000	100,000,000	75,000,000
Number of votes for each share | vote				1
Common stock, shares issued (in shares)	5,218,209		3,560,604	1,926,848
Shares converted (in shares)			1,692,849
Series I Warrants
Class of Stock [Line Items]
Number of warrants issued (shares)	3,016,853
Exercisable price of warrants to purchase common stock (price per share) | $ / shares	$ 0.0000001
Number of securities called by each warrant (in shares)	1
Series 2 warrants
Class of Stock [Line Items]
Number of warrants issued (shares)	712,736
Exercisable price of warrants to purchase common stock (price per share) | $ / shares	$ 0.0000001
Number of securities called by each warrant (in shares)	1
Amended and Restated Credit Agreement | Term Loan
Class of Stock [Line Items]
Holders of allowed claims percentage of common stock outstanding upon reorganization	83.50%
Senior Notes | Senior Notes at 7.75%
Class of Stock [Line Items]
Holders of allowed claims percentage of common stock outstanding upon reorganization	16.50%
Interest rate	7.75%						7.75%