Agreement with Roust Trading - Additional Information (Detail) (USD $)	12 Months Ended		1 Months Ended		12 Months Ended			12 Months Ended			1 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	May 07, 2012 Roust Trading Limited	Mar. 08, 2013 Roust Trading Limited Securities Purchase Agreement	Dec. 31, 2012 Roust Trading Limited Securities Purchase Agreement	Dec. 31, 2012 Roust Trading Limited Securities Purchase Agreement Maximum	Dec. 31, 2012 Roust Trading Limited Securities Purchase Agreement Minimum	Dec. 31, 2012 Roust Trading Limited Securities Purchase Agreement After Execution of Amended Securities Purchase Agreement	Dec. 31, 2012 Roust Trading Limited Securities Purchase Agreement After Stockholder Approval	Dec. 31, 2012 Roust Trading Limited Securities Purchase Agreement After Backstop Escrow Release Date	May 07, 2012 Roust Trading Limited Senior Notes Due 2013	May 07, 2012 Roust Trading Limited Senior Rollover Notes Due 2013	May 07, 2012 Roust Trading Limited Senior Backstop Notes
Long-term Purchase Commitment [Line Items]
Senior notes purchased by affiliates											$ 70,000,000
Senior notes purchased by affiliates due date											March 18, 2013
Interest rate percentage on issued debt	3.00%										3.00%	6.00%	6.00%
Common stock purchase value under purchase agreement	30,000		30,000,000
Common stock issued under purchase agreement, shares			5,714,286					3,000,000	5,000,000	2,000,000	13,300,000
Common stock purchase price under purchase agreement			$ 5.25
Common stock that could be potentially repurchased					30,000,000
Debt instrument issuance amount	70,000,000											102,600,000	107,500,000
Debt instrument maturity date					Jul. 31, 2016							Jul. 31, 2016	Jul. 31, 2016
Notes converted to shares, price per share					$ 3.44
Weighted average price of common stock						$ 4.13	$ 2.75
Minimum ownership percentage of outstanding stock above which triggers tender offer					42.90%
Common stock purchase price under purchase agreement	$ 0.01	$ 0.01						$ 0.01
Release of restrictions on cash previously invested					50,000,000
Additional borrowing under revolving credit facility					15,000,000
Cash investment from Notes holder	$ 172,000,000			$ 172,000,000	$ 107,000,000
Percentage of issued and outstanding shares of common stock exchanged for investment				85.00%
Percentage of common stock owned by RTL				100.00%