Contingent Liabilities and Commitments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013
Commitment And Contingencies [Line Items]
Contingent liabilities for guarantees of consolidated subsidiaries	$ 3.2

Contingent liabilities for guarantees of consolidated subsidiaries.

No definition available.

Name:	stc_ContingentLiabilitiesForGuaranteesOfConsolidatedSubsidiaries
Namespace Prefix:	stc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant