Long-Term Debt - Additional Information (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
Long-term Debt, Unclassified [Abstract]
Interest expense on debt	$ 2,626	$ 847	$ 7,809	$ 2,379
Non-cash interest expense	$ 823	$ 42	$ 2,411	$ 116
Debt discount, remaining amortization period			4 years 6 months