Stock Incentive Plans - Additional Information (Detail) (USD $)	0 Months Ended	1 Months Ended								2 Months Ended			7 Months Ended	12 Months Ended									0 Months Ended	1 Months Ended
	Aug. 02, 2011	Oct. 31, 2013	Jul. 31, 2012	Jan. 31, 2012	Dec. 31, 2011	Oct. 31, 2011	Jul. 31, 2011	May 31, 2011	Jan. 31, 2011	Oct. 31, 2012	May 31, 2012	Apr. 30, 2011	Jul. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Restricted stock [Member]	Dec. 31, 2012 Restricted stock [Member]	Dec. 31, 2011 Restricted stock [Member]	Dec. 31, 2013 Restricted stock units [Member]	Dec. 31, 2013 Board of Directors [Member]	Dec. 31, 2013 Board of Directors [Member] Restricted stock [Member]	Aug. 02, 2011 2001 Plan [Member]	Jun. 30, 2013 2007 Plan [Member]	Jul. 22, 2013 2007 Plan [Member] Minimum [Member]	Jul. 22, 2013 2007 Plan [Member] Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares awarded or sold																							1,449,667		2,307,692	4,407,692
Number of share of common stock purchased	1
Plan expiration date																							Aug. 02, 2011
Increase in maximum number of shares awarded or sold under 2007 plan																								2,100,000
Weighted average fair value of the options vested														$ 4,800,000	$ 8,000,000	$ 3,900,000
Intrinsic value of options outstanding														0	0
Intrinsic value for options exercisable														0	0
Stock compensation expense														1,200,000	1,800,000	2,300,000
Unrecognized compensation cost related to non vested awards														3,100,000						3,100,000
Stock based plan expect to recognize weighted average period														1 year 11 months 23 days
Restricted stock units granted														73,707	17,345	7,724				45,941
Intrinsic Value at date of grant																				$ 395,000
RSU Expense																				25,000
RSU granted																				25.00%
Restricted stock units granted, market price																				$ 8.60
RSUs intrinsic value																				556,000
Weighted average period																				3 years 9 months
Stock compensation expense																	$ 292,000	$ 162,000	$ 165,000
Stock options to purchase shares of common stock granted		14,450	7,000	8,500	143,000	75,400	12,500	51,650	26,000	36,800	36,750	73,500	82,815	97,265	89,050	382,050					365	47,050
Exercise price														$ 8.43	$ 9.72	$ 16.02					$ 7.97