Stockholders' Equity - Schedule of Stock Based Compensation Expense Awards under Equity Plans (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based compensation	$ 3,838,000	$ 3,045,000	$ 1,224,000
2009 LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based compensation	0	0	900,000
2011 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based compensation	3,400,000	2,800,000	100,000
Equity Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based compensation	3,838,000	3,045,000	1,224,000
Equity Awards [Member] | 2009 LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based compensation	0	0	897,000
Equity Awards [Member] | 2011 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based compensation	3,416,000	2,823,000	117,000
Equity Awards [Member] | Board of Directors Compensation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based compensation	337,000	222,000	210,000
Common Stock [Member] | Equity Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based compensation	$ 85,000	$ 0	$ 0