Stockholders' Equity - Schedule of Stock Based Compensation Expense for Awards Under Equity Plans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	$ 1,106	$ 946	$ 2,816	$ 2,200
Common Stock [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	85	0	85	0
2011 LTIP [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	930	906	2,486	2,040
Board of Directors Compensation [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	$ 91	$ 40	$ 245	$ 160