Segment and Geographical Information - Narrative (Details) $ in Millions	3 Months Ended	12 Months Ended
Dec. 31, 2015 USD ($) core_business_area	Dec. 31, 2015 segment core_business_area
Segment Reporting [Abstract]
Number of reportable segments \| segment		5
Sale of timberlands reclassification threshold \| $	$ 20
Number of core business areas \| core_business_area	2	2

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

No definition available.

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration