Credit Commitments and Concentrations of Credit Risk - Schedule of Loan Commitments and Guarantees (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Commitments And Guarantee Obligations [Line Items]
Guarantees written	$ 24,695	$ 28,455
Variable Rate [Member]
Commitments And Guarantee Obligations [Line Items]
Credit commitments	234,760	211,332
Fixed Rate [Member]
Commitments And Guarantee Obligations [Line Items]
Credit commitments	$ 2,563	$ 6,307

The amount the entity has committed to make for future royalty guarantees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 928

-SubTopic 440

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6473578&loc=d3e63223-108013

Name:	us-gaap_RoyaltyGuaranteesCommitmentsAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant