Stock Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Class of Warrant or Right [Line Items]
Restricted stock and phantom stock, vesting period following the grant date		10 days
Common stock, price per share		$ 5.25
Warrant issued to purchase company's stock	200,000
Warrant issued to purchase company's stock, exercise price	$ 3.49
Restricted Stock
Class of Warrant or Right [Line Items]
Unrecognized compensation cost related to nonvested stock awards, period of recognition (in years)	3 years
Unrecognized compensation cost related to nonvested stock awards	$ 6.2
Phantom Stock Awards
Class of Warrant or Right [Line Items]
Compensation awards, number of shares of stock granted		380,000
Period 1
Class of Warrant or Right [Line Items]
Nonvested common stock awards employment obligations (in years)	1 year
Period 2
Class of Warrant or Right [Line Items]
Nonvested common stock awards employment obligations (in years)	2 years
Period 3
Class of Warrant or Right [Line Items]
Nonvested common stock awards employment obligations (in years)	4 years