Stockholders' Equity - Schedule of Stock Based Compensation Expense for Awards Under Equity Plans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	$ 624	$ 628	$ 1,710	$ 1,254
2011 LTIP [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	542	568	1,556	1,134
Board of Directors Compensation [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	$ 82	$ 60	$ 154	$ 120