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Share Repurchases (Details) In Millions	Jun. 30, 2011	Sep. 30, 2001
Common Stock Repurchase Authorized
Stock Repurchase Shares	6.5	15.4

X

- Definition

Common Stock Repurchase Authorized [Line Items]

+ Details

Name:	htld_CommonStockRepurchaseAuthorizedLineItems
Namespace Prefix:	htld
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of shares authorized by an entity's Board of Directors under a stock repurchase plan.

+ Details

Name:	htld_StockRepurchaseShares
Namespace Prefix:	htld
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant