Investments in Unconsolidated Affiliates - Combined Financial Information of Unconsolidated Affiliated Companies (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Assets:
Current assets	$ 52,925
Noncurrent assets	123,860
Total assets	176,785
Liabilities:
Current liabilities	39,221
Noncurrent liabilities	63,941
Total liabilities	103,162
Results of operations:
Revenue	23,613	31,475
Operating income	11,318	(7,820)
Income from continuing operations	6,310	(5,083)
Net income	$ 6,310	$ (5,083)

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The amount of assets reported by an equity method investment of the entity.

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