Commitments and Contingencies (Details Textual) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013
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