Consolidated Financial Statements - Additional Information (Detail)	9 Months Ended
Sep. 30, 2013
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Percentage of insurance commission revenue of total revenue	less than 1.0%
Water St. [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Percentage of insurance commission revenue of total revenue	less than 1.0%
Number of reportable segment	1

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