Share Repurchase Program - Share Repurchase Programs (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended			24 Months Ended	1 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Sep. 30, 2011 August 25, 2011 through September 30, 2011	Dec. 31, 2012 October 1, 2011 through December 31, 2011	Dec. 31, 2013 January 1, 2012 through March 31, 2012	Jun. 30, 2012 April 1, 2012 through June 30, 2012	Sep. 30, 2012 Period
Phase One Program
Total Number of Shares Purchased	2,306,590			2,306,590	571,554	130,160	334,636	1,124,797	145,443
Average Price Paid Per Share				$ 5.20	$ 5.89	$ 5.71	$ 5.64	$ 4.70	$ 4.88
Total Cost		$ 7,889	$ 4,111	$ 12,000	$ 3,367	$ 744	$ 1,889	$ 5,290	$ 710
Maximum Dollar Value of Shares That May Yet Be Purchased Under the Program					$ 2,633	$ 1,889		$ 710