Subsequent Events - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended			1 Months Ended
	Dec. 31, 2011 Restricted Stock	Dec. 31, 2011 Subsequent Event	Feb. 28, 2012 Subsequent Event	Jan. 31, 2012 Subsequent Event Restricted Stock	Jan. 31, 2012 Subsequent Event Phantom Stock
Subsequent Event [Line Items]
Shares or units awarded to certain employees				54,572	2,755
Fair value of the stock award on the date of grant				$ 6,528	$ 330
Vesting period	3 years			3 years
Revolving credit facility, drew down		10,000
Outstanding revolving credit facility			$ 10,000