Other Long-Term Liabilities - Summary of Other Long-Term Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Other Liabilities Disclosure [Abstract]
Asset retirement obligations	$ 7,599	$ 7,557
Dividends payable—2011 LTIP	409	186
Escheat liability	509	926
Capital lease payable	23	53
Lease incentive	180	332
Deferred rent	259	341
Royalty payable	280	394
Total other long-term liabilities	$ 9,259	$ 9,789