Interim Financial Statements - Additional Information (Detail)	Jun. 30, 2013
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]
Percentage of voting rights owned in electing directors	50.00%
Minimum \| Stewart Information Services Corporation and subsidiaries
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]
Percentage of voting rights owned in electing directors	20.00%
Maximum \| Stewart Information Services Corporation and subsidiaries
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]
Percentage of voting rights owned in electing directors	50.00%

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant