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Segment Reporting - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Segment	Dec. 31, 2013
Segment Reporting [Abstract]
Number of reporting segments	3us-gaap_NumberOfReportableSegments
Receivables from unconsolidated affiliates	$ 20,061us-gaap_DueFromAffiliateCurrent	$ 36,181us-gaap_DueFromAffiliateCurrent

- Definition

Amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership, due within 1 year (or 1 business cycle).

+ References+ Details