Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ 37,840us-gaap_NetIncomeLoss	$ 12,305us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property, equipment and intangibles	61,131	60,379
Amortization of debt issuance costs, original issue discount, and losses on terminated swaps	2,606	2,515
Gain on disposal of property and equipment less write-off of totaled tractors	(3,698)	(2,958)
Impairments	1,480us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges
Deferred income taxes	(6,346)swft_DeferredIncomeTaxChange	(7,942)swft_DeferredIncomeTaxChange
Provision for losses on accounts receivable	1,913us-gaap_ProvisionForDoubtfulAccounts	792us-gaap_ProvisionForDoubtfulAccounts
Non-cash loss on debt extinguishment and write-offs of deferred financing costs and original issue discount	0swft_GainsLossesOnExtinguishmentsOfDebt	2,913swft_GainsLossesOnExtinguishmentsOfDebt
Non-cash equity compensation	1,483us-gaap_ShareBasedCompensation	1,061us-gaap_ShareBasedCompensation
Excess Tax Benefits from Stock-based Compensation, Operating Activities	1,172	1,078
Income effect of mark-to-market adjustment of interest rate swaps	(119)	(32)
Increase (decrease) in cash resulting from changes in:
Accounts receivable	24,329	(37,064)
Inventories and supplies	918	653
Prepaid expenses and other current assets	16,789	18,446
Other assets	1,450	2,871
Accounts payable, accrued and other liabilities	(10,447)	23,296
Net cash provided by operating activities	128,157	76,157
Cash flows from investing activities:
(Increase) decrease in restricted cash	(16,071)	3,821
Proceeds from Sale and Maturity of Held-to-maturity Securities	14,190	9,500
Payments to Acquire Restricted Investments	(8,016)	(9,664)
Proceeds from sale of property and equipment	13,370	28,428
Capital expenditures	(62,006)	(60,058)
Payments received on notes receivable	2,065	1,553
Expenditures on assets held for sale	(2,313)swft_ExpendituresOnAssetsHeldForSale	(1,521)swft_ExpendituresOnAssetsHeldForSale
Payments received on assets held for sale	1,815	2,269
Payments received on equipment sale receivables	352	469
Net cash used in investing activities	(56,614)	(25,203)
Cash flows from financing activities:
Repayment of long-term debt and capital leases	(19,294)	(46,526)
Proceeds from long-term debt	4,504	0
Net repayments on revolving line of credit	(57,000)	(17,000)
Borrowings under accounts receivable securitization	10,000	0
Repayment of accounts receivable securitization	(50,000)	(5,000)
Proceeds from common stock issued	2,679	3,414
Excess Tax Benefit from Share-based Compensation, Financing Activities	(1,172)	(1,078)
Net cash used in financing activities	(107,939)	(64,034)
Net decrease in cash and cash equivalents	(36,396)	(13,080)
Cash and cash equivalents at beginning of period	105,132
Cash and cash equivalents at end of period	68,736
Cash paid during the period for:
Interest	13,912us-gaap_InterestPaid	11,854us-gaap_InterestPaid
Income taxes	1,507us-gaap_IncomeTaxesPaidNet	3,463us-gaap_IncomeTaxesPaidNet
Non-cash investing activities:
Equipment purchase accrual	59,814	59,867
Notes Issued	1,298us-gaap_NotesIssued1	2,762us-gaap_NotesIssued1
Equipment sales receivables	753swft_EquipmentSalesReceivables	7,376swft_EquipmentSalesReceivables
Non-cash financing activities:
Capital lease additions	$ 9,988us-gaap_CapitalLeaseObligationsIncurred	$ 0us-gaap_CapitalLeaseObligationsIncurred

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Period Type:	duration

- Definition

Proceeds from securitizations of receivables treated as collateralized borrowings, which are classified as financing transactions.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the collection of receivables arising from the financing of goods and services.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

The cash inflow associated with principal collections from a borrowing supported by a written promise to pay an obligation.

+ References

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Data Type:	xbrli:monetaryItemType
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- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-Subparagraph c

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

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- Definition

Amount of cash inflow from the sale or maturity of long-term held-to-maturity securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

+ Details

Name:	us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ 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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.5)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 5

-Article 5

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- Definition

Repayments of securitizations of receivables treated as collateralized borrowings, which are classified as financing transactions.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

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

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- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt and payment of capital lease obligations.

+ References

No definition available.

+ Details

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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