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Segment Reporting - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014 Segment	Dec. 31, 2014 Segment	Dec. 31, 2013 Segment
Segment Reporting [Abstract]
Number of reporting segments	4us-gaap_NumberOfReportableSegments
Number of operating segments	4us-gaap_NumberOfOperatingSegments	4us-gaap_NumberOfOperatingSegments	3us-gaap_NumberOfOperatingSegments
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