Stockholder's Equity - Schedule of Performance Stock Unit Awards and Stock Option Granted Under Long Term Incentive Program (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Stock Options	904,380
Exercise Price	$ 4.01
Long Term Incentive Program [Member] | Grant Date May 17, 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date	May 17, 2011
Long Term Incentive Program [Member] | Grant Date May 17, 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date	May 17, 2012
Long Term Incentive Program [Member] | Grant Date July 6, 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date	Jul. 06, 2012
Long Term Incentive Program [Member] | Grant Date May 22, 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date	May 22, 2013
Performance Stock Units [Member] | Long Term Incentive Program [Member] | Grant Date May 17, 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Units	182,000
Fair Value on Grant Date	$ 1.66
Performance Stock Units [Member] | Long Term Incentive Program [Member] | Grant Date May 17, 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Units
Fair Value on Grant Date
Performance Stock Units [Member] | Long Term Incentive Program [Member] | Grant Date July 6, 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Units	137,715
Fair Value on Grant Date	$ 4.26
Performance Stock Units [Member] | Long Term Incentive Program [Member] | Grant Date May 22, 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Units	185,185
Fair Value on Grant Date	$ 3.96
Restricted Stock [Member] | Long Term Incentive Program [Member] | Grant Date May 17, 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Units
Fair Value on Grant Date
Restricted Stock [Member] | Long Term Incentive Program [Member] | Grant Date May 17, 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Units
Fair Value on Grant Date
Restricted Stock [Member] | Long Term Incentive Program [Member] | Grant Date July 6, 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Units
Fair Value on Grant Date
Restricted Stock [Member] | Long Term Incentive Program [Member] | Grant Date May 22, 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Units	185,185
Fair Value on Grant Date	$ 3.96
Stock Options [Member] | Long Term Incentive Program [Member] | Grant Date May 17, 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Stock Options	317,000
Exercise Price	$ 1.66
Stock Options [Member] | Long Term Incentive Program [Member] | Grant Date May 17, 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Stock Options	470,000
Exercise Price	$ 2.94
Stock Options [Member] | Long Term Incentive Program [Member] | Grant Date July 6, 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Stock Options	178,731
Exercise Price	$ 4.26
Stock Options [Member] | Long Term Incentive Program [Member] | Grant Date May 22, 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Stock Options	327,381
Exercise Price	$ 3.96