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STOCKHOLDERS' EQUITY (Details 4) (USD $)	0 Months Ended	3 Months Ended		1 Months Ended
	May 01, 2015	Mar. 31, 2015	Mar. 31, 2014	Feb. 28, 2015	Dec. 31, 2014
Dividends on Common Stock
Dividends declared (in dollars per share)	$ 0.06us-gaap_CommonStockDividendsPerShareDeclared	$ 0.06us-gaap_CommonStockDividendsPerShareDeclared	$ 0.03us-gaap_CommonStockDividendsPerShareDeclared
Dividend Amount		$ 1,584,000us-gaap_DividendsCommonStockCash	$ 819,000us-gaap_DividendsCommonStockCash
Treasury Stock
Aggregate cost of shares repurchased during the period		2,459,000us-gaap_PaymentsForRepurchaseOfCommonStock
Stock Repurchase Program
Treasury Stock
Number of shares repurchased to date					1,618,150arcb_StockRepurchasedBalance / us-gaap_ShareRepurchaseProgramAxis = arcb_StockRepurchaseProgramMember
Aggregate cost of shares repurchased to date					56,800,000arcb_StockRepurchaseAggregateCost / us-gaap_ShareRepurchaseProgramAxis = arcb_StockRepurchaseProgramMember
Number of shares repurchased during the period				64,200us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = arcb_StockRepurchaseProgramMember
Aggregate cost of shares repurchased during the period				2,500,000us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_ShareRepurchaseProgramAxis = arcb_StockRepurchaseProgramMember
Amount available for repurchase under the current buyback program		$ 15,700,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_ShareRepurchaseProgramAxis = arcb_StockRepurchaseProgramMember

X

- Definition

The aggregate cost of shares repurchased to date under a stock repurchase program.

+ References

No definition available.

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- Definition

Number of shares repurchased to date under a stock repurchase plan.

+ References

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+ Details

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- Details

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X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

The cash outflow to reacquire common stock during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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