Stockholders' Equity - Schedule of Stock Based Compensation Expense for Awards Under Equity Plans (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	$ 662	$ 624	$ 1,104	$ 1,710
2011 LTIP [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	0	542	0	1,556
2015 LTIP [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	569	0	919	0
Board of Directors Compensation [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	$ 93	$ 82	$ 185	$ 154