Investment in Unconsolidated Affiliates - Combined Financial Information of Unconsolidated Affiliated Companies (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Assets:
Current assets	$ 58,852	$ 57,492
Noncurrent assets	142,986	161,280
Total assets	201,838	218,772
Liabilities:
Current liabilities	46,105	44,366
Noncurrent liabilities	74,695	86,658
Total liabilities	120,800	131,024
Results of operations:
Revenue	162,432	146,972	168,893
Net loss	$ (2,900)	$ (5,693)	$ (1,102)