Subsequent Event - Additional Information (Detail) - Subsequent Event	Oct. 01, 2016 Branch
Greenpoint Insurance Group \| North Carolina
Subsequent Event [Line Items]
Number of operating branches sold	2
Carr and Hyde Insurance \| Virginia
Subsequent Event [Line Items]
Number of operating branches sold	2

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

No definition available.

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration