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Long-Term Debt and Financing Arrangements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 Equipment Note [Member] Vehicle	Mar. 31, 2014 Standby Letters of Credit [Member]	Mar. 31, 2014 Revolving Line of Credit Facility [Member]	Dec. 31, 2013 Revolving Line of Credit Facility [Member]
Debt Instrument [Line Items]
Outstanding letters of credit		$ 5.1
Letters of credit expiration, years		2014 and 2015
Unused and available borrowings under bank revolving line of credit			44.9	44.8
Notes, expiration, start date	Jan. 15, 2019
Notes, expiration, end date	Feb. 28, 2019
Notes, fixed interest rate, minimum	1.87%
Notes, fixed interest rate, maximum	1.93%
Notes, quarterly principal and interest payments	$ 0.4
Notes, number of tractors financing	200

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Letter Of Credit Facility Expiration Date

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When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

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-Publisher SEC

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Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

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Earliest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

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Amount of the required periodic payments including both interest and principal payments.

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Amount borrowed under the credit facility as of the balance sheet date.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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