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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Significant Accounting Policies [Line Items] |  |  |  |
Restricted cash |  | $ (359,388) | $ 359,388 | $ 0
Property and equipment, depreciation method |  | Depreciation is computed using the straight-line method over the estimated lives of the assets of 3 to 30 years. |  |
Software |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Intangible assets, estimated lives (in years) |  | 3 years |  |
Intangible assets, amortization method |  | We amortize software using the straight-line method over 3 years. |  |
Minimum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property and equipment, estimated lives (in years) |  | 3 years |  |
Intangible assets, estimated lives (in years) |  | 3 years |  |
Restricted shares and restricted units grants, discount for post-vesting holding restrictions (percent) |  | 17.00% |  |
Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property and equipment, estimated lives (in years) |  | 30 years |  |
Intangible assets, estimated lives (in years) |  | 8 years |  |
Restricted shares and restricted units grants, discount for post-vesting holding restrictions (percent) |  | 22.00% |  |
Freightquote |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Restricted cash | $ 359,400 |  |  |
Truckload Transactions |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of truckload transactions that are shared transactions between branches |  | 49.00% |  |
Stock Option |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Stock award, vesting period (in years) |  | 5 years |  |

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The amortization method of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company. The straight-line method is the preferred amortization method, unless another method better reflects the pattern in which the asset is consumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 35 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=26713198&loc=d3e15372-109273 + Details
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- Definition The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition Description of the methodology for computing depreciation for classes of depreciable assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Restrictions on equity-based instruments during the vesting period, such as the inability to transfer unvested awards, are not taken into account in estimating the fair value of the award. However, restrictions that remain in effect after an award is vested, such as the inability to transfer or hedge vested options or a prohibition on the sale of outstanding vested shares (or other type of equity) for a period of time, affect the estimate of an award's fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(v) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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