Stockholders' Equity and Stock-Based Compensation - Summary of Purchases (Detail) (USD $)	6 Months Ended	12 Months Ended							6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013 2013 Shares Repurchase Programs [Member]	Dec. 31, 2013 2013 Shares Repurchase Programs [Member] May 1, 2013-May 31, 2013 [Member]	Dec. 31, 2013 2013 Shares Repurchase Programs [Member] June 1, 2013-June 30, 2013 [Member]	Dec. 31, 2013 2013 Shares Repurchase Programs [Member] July 1, 2013-July 31, 2013 [Member]	Dec. 31, 2013 2013 Shares Repurchase Programs [Member] August 1, 2013-August 31, 2013 [Member]	Dec. 31, 2013 2013 Shares Repurchase Programs [Member] September 1, 2013-September 30, 2013 [Member]	Dec. 31, 2013 2013 Shares Repurchase Programs [Member] October 1, 2013-October 31, 2013 [Member]	Jun. 30, 2014 2014 Shares Repurchase Program [Member]	Jun. 30, 2014 2014 Shares Repurchase Program [Member] May 1, 2014-May 31, 2014 [Member]	Jun. 30, 2014 2014 Shares Repurchase Program [Member] June 1, 2014-June 30, 2014 [Member]
Equity, Class of Treasury Stock [Line Items]
Total Number of Shares Purchased	2,158,641	1,682,191	182,818	1,132,734	118,275	21,887	108,886	117,591	476,450	152,656	323,794
Average Price Paid Per Share	$ 3.68	$ 3.10	$ 2.80	$ 3.02	$ 3.07	$ 3.31	$ 3.63	$ 3.77	$ 5.73	$ 5.71	$ 5.75