Segment Information (Details 4) (Accounts Receivable, Geographic concentration, Foreign Country, USD $)	Dec. 31, 2014	Dec. 31, 2013
Accounts Receivable \| Geographic concentration \| Foreign Country
Concentration Risk
Foreign receivables, excluding receivables due from affiliates	$ 266,510,000	$ 340,748,000

Amounts due from foreign customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. These exclude amounts due from affiliates.

No definition available.

Name:	seb_ForeignAccountsReceivableExcludingReceivablesFromAffiliates
Namespace Prefix:	seb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant