Commitments and Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013
Commitments and Contingencies [Abstract]
Contingent liability, premium taxes	$ 4.5
Contingent liability, penalties and interest	$ 0.9

The amount represents the assertion from the Texas Comptrollers office related to penalties and interest.

No definition available.

Name:	hall_ContingentLiabilityPenaltiesAndInterest
Namespace Prefix:	hall_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant