Investments in Unconsolidated Affiliates - Combined Financial Information of Unconsolidated Affiliated Companies (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Assets:
Current assets	$ 50,692		$ 50,692
Noncurrent assets	119,895		119,895
Total assets	170,587		170,587
Liabilities:
Current liabilities	32,823		32,823
Noncurrent liabilities	61,648		61,648
Total liabilities	94,471		94,471
Results of operations:
Revenue	41,252	$ 45,982	104,777	$ 113,700
Operating (loss) income	(3,505)	2,786	(10,134)	(10,643)
Income from continuing operations	2,694	1,453	9,087	(7,222)
Net income	$ 2,694	$ 1,453	$ 9,087	$ (7,222)