Investments in Unconsolidated Affiliates - Combined Financial Information of Unconsolidated Affiliated Companies (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Assets:
Current assets	$ 53,894
Noncurrent assets	118,373
Total assets	172,267
Liabilities:
Current liabilities	36,092
Noncurrent liabilities	51,320
Total liabilities	87,412
Results of operations:
Revenue	37,568	$ 23,613
Operating (loss) income	(2,572)	11,318
(Loss) income from continuing operations	(1,642)	6,310
Net (loss) income	$ (1,642)	$ 6,310