Investments in Unconsolidated Affiliates - Combined Financial Information of Unconsolidated Affiliated Companies (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Assets:
Current assets	$ 44,207		$ 44,207
Noncurrent assets	134,602		134,602
Total assets	178,809		178,809
Liabilities:
Current liabilities	38,917		38,917
Noncurrent liabilities	69,498		69,498
Total liabilities	108,415		108,415
Results of operations:
Revenue	36,243	40,946	67,718	58,734
Operating loss	(5,609)	(1,253)	(13,429)	(15,767)
Loss from continuing operations	(3,592)	(1,145)	(8,675)	(10,498)
Net loss	$ (3,592)	$ (1,145)	$ (8,675)	$ (10,498)