Investments in Unconsolidated Affiliates - Combined Financial Information of Unconsolidated Affiliated Companies (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
Assets:
Current assets	$ 50,555		$ 50,555
Noncurrent assets	130,648		130,648
Total assets	181,203		181,203
Liabilities:
Current liabilities	40,419		40,419
Noncurrent liabilities	66,994		66,994
Total liabilities	107,413		107,413
Results of operations:
Revenue	45,982	52,526	113,700	111,260
Operating income (loss)	2,786	7,123	(10,643)	(8,643)
Income (loss) from continuing operations	1,453	3,796	(7,222)	(6,702)
Net income (loss)	$ 1,453	$ 3,796	$ (7,222)	$ (6,702)