Share Repurchase Program - Share Repurchase Programs (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended		13 Months Ended	1 Months Ended	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2012	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Mar. 31, 2012	Jun. 30, 2012	Sep. 30, 2012
Phase One Program
Total Number of Shares Purchased	2,306,590		2,306,590
Average Price Paid Per Share			$ 5.20
Total Cost		$ 7,889	$ 12,000
August 25, 2011 through September 30, 2011
Phase One Program
Total Number of Shares Purchased				571,554
Average Price Paid Per Share				$ 5.89
Total Cost				3,367
Maximum Dollar Value of Shares That May Yet Be Purchased Under the Program				2,633
October 1, 2011 through December 31, 2011
Phase One Program
Total Number of Shares Purchased					130,160
Average Price Paid Per Share					$ 5.71
Total Cost					744
Maximum Dollar Value of Shares That May Yet Be Purchased Under the Program					1,889
January 1, 2012 through March 31, 2012
Phase One Program
Total Number of Shares Purchased						334,636
Average Price Paid Per Share						$ 5.64
Total Cost						1,889
April 1, 2012 through June 30, 2012
Phase One Program
Total Number of Shares Purchased							1,124,797
Average Price Paid Per Share							$ 4.70
Total Cost							5,290
Maximum Dollar Value of Shares That May Yet Be Purchased Under the Program							710
Period
Phase One Program
Total Number of Shares Purchased								145,443
Average Price Paid Per Share								$ 4.88
Total Cost								$ 710