Warehouse Purchase (Details) (Warehouse [Member], USD $) In Millions, unless otherwise specified	1 Months Ended
Apr. 30, 2011
Warehouse [Member]
Area of warehouse in square feet	449,000
Warehouse purchase amount	$ 20.5

Name:

us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds

Namespace Prefix:

us-gaap

Data Type:

xbrli:monetaryItemType

Balance Type:

debit

Period Type:

instant