Long Term Debt - Interest Included in Consolidated Income Statement (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Interest Expense Debt [Abstract]
Cash interest expense	$ 578	$ 553
Non-cash amortization of debt discount	135	154
Amortization of debt costs	48	44
Amortization of settlement obligations	52	75
Interest expense capital lease	4
Total interest expense	$ 817	$ 826