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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair value disclosure
Cash and cash equivalents	$ 157,042,000	$ 105,354,000	$ 90,702,000	$ 141,295,000
Short-term investments	45,909,000us-gaap_ShortTermInvestments	35,906,000us-gaap_ShortTermInvestments
Restricted cash, cash equivalents, and short-term investments	1,386,000	1,902,000
Concentrations of Credit Risk of Financial Instruments
Cash, cash equivalents, and certificates of deposit which are not FDIC-insured	77,300,000arcb_DepositsUninsuredAmount	49,400,000arcb_DepositsUninsuredAmount
Fair value disclosure
Fair value disclosure
Cash and cash equivalents	157,042,000	105,354,000
Fair value disclosure \| Cash deposits
Fair value disclosure
Cash and cash equivalents	99,615,000	63,547,000
Restricted cash, cash equivalents, and short-term investments	1,386,000	1,902,000
Fair value disclosure \| Variable rate demand notes
Fair value disclosure
Cash and cash equivalents	16,326,000	29,706,000
Fair value disclosure \| Money market funds
Fair value disclosure
Cash and cash equivalents	41,101,000	12,101,000
Fair value disclosure \| Certificates of deposit
Fair value disclosure
Short-term investments	$ 45,909,000	$ 35,906,000

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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