Shareholder's Equity - Additional Information (Detail) (USD $) In Thousands, except Share data	3 Months Ended	6 Months Ended	64 Months Ended			1 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jun. 30, 2012	Oct. 31, 2011	Mar. 31, 2007	May 29, 2012 Employees and Directors	Jan. 31, 2012 Employees and Directors	Jun. 30, 2012 Awards Granted during Twenty Twelve
Capital Unit [Line Items]
Shares authorized for repurchase					2,500,000
Shares authorized for repurchase				5,000,000
Shares repurchased, shares	391,919	571,911	2,641,211
Shares repurchased, value	$ 592	$ 950	$ 4,196
Options granted in period						25,000	3,630,000
Option exercise price						$ 1.47	$ 2.80
Vesting Period						4 years	4 years
Fair value of option						26	4,345
Option expiration date						May 29, 2022	Jan. 31, 2022
Unrecognized compensation cost for stock based compensation	14,001	14,001	14,001					3,775
Unrecognized compensation cost for stock based compensation, period of recognition		1 year 8 months 12 days						3 years 6 months
Stock Options Exercise		771,500
Intrinsic value of options exercised		$ 1,625