Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended			1 Months Ended		3 Months Ended				0 Months Ended				6 Months Ended	3 Months Ended
	Jun. 30, 2014 Class_Of_Stock	Sep. 16, 2011	Dec. 31, 2011 Citadel Acquisition	Jun. 30, 2009 2009 warrants	Jun. 30, 2014 2009 warrants	Jun. 30, 2014 Company Warrants	Jun. 30, 2014 Equity Investment	Sep. 16, 2011 Equity Investment	Sep. 16, 2011 Crestview Warrants	Oct. 16, 2013 Class A common stock	Jun. 30, 2014 Class A common stock	Dec. 31, 2013 Class A common stock	Sep. 16, 2011 Class A common stock Citadel Acquisition	Jun. 30, 2014 Class A common stock Minimum	Jun. 30, 2014 Class B common stock	Dec. 31, 2013 Class B common stock	Jun. 30, 2014 Class C common stock	Dec. 31, 2013 Class C common stock	Jun. 30, 2014 Series A Redeemable Preferred Stock	Oct. 16, 2013 Series B cumulative redeemable preferred stock
Class of Stock [Line Items]
Total stock dividend authorized to issue	1,450,644,871
Number of classes of stock	4
Common stock, shares authorized											750,000,000	750,000,000			600,000,000	600,000,000	644,871	644,871
Common stock, shares issued										18,860,000	253,776,605	222,399,019	71,700,000		0	15,424,944	644,871	644,871
Preferred stock, shares authorized																			100,000,000
Par value of Preferred stock shares		$ 0.01																	$ 0.01
Number of shares with option to purchase										2,460,000
Purchase price per share										$ 5.00
Net proceeds after underwriting discounts and commissions and estimated offering expenses										$ 89.8
Cumulative redeemable preferred stock																				78.0
Class A common stock following conversion														4.99%
Shares of common stock converted															3,300,000
Warrants issued				1,300,000
Exercisable price of warrants to purchase common stock				$ 1.17					$ 4.34
Warrants outstanding					500,000	2,500,000
Warrants held in reserve for issuance			2,400,000
Shares issued from reserve due to closing of Citadel Bankruptcy	2,400,000
Value of shares issued from reserve due to closing of Citadel Bankruptcy	$ 25.0
Company Warrants were converted into shares of Class A common stock since issuance						11,500,000
Warrants outstanding							7,800,000	7,800,000