Stockholders' Equity - Schedule of Stock Based Compensation Expense for Awards Under Equity Plans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	$ 394	$ 1,106	$ 1,497	$ 2,816
2011 LTIP [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	0	930	0	2,486
2015 LTIP [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	301	0	1,220	0
Board of Directors Compensation [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	93	91	277	245
Common Stock [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	$ 0	$ 85	$ 0	$ 85