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Reportable Segments - Selected Financial Data for Each of Operating Segments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | $ 137,091 | $ 54,540 | $ 251,090 | $ 99,100 |
Operating income (loss) from operations | (14,015) | (3,368) | (25,382) | (7,592) |
Depreciation and amortization | 1,795 | 423 | 3,349 | 741 |
Interest expense (income) | 3,106 | 3 | 6,170 | 15 |
Tax provision (benefit) | 74 | 1,780 | 296 | 259 |
Goodwill | 69,927 | 19,084 | 69,927 | 19,084 | 55,947
Total assets | 394,479 | 260,731 | 394,479 | 260,731 | 413,208
Freight Brokerage [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill | 49,145 |  | 49,145 |  | 38,988
Expedited Transportation [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill | 11,560 |  | 11,560 |  | 7,737
Freight Forwarding [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill | 9,222 |  | 9,222 |  | 9,222
Operating Segments [Member] | Freight Brokerage [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 95,360 | 13,877 | 173,590 | 21,805 |
Operating income (loss) from operations | (4,990) | (825) | (8,810) | (911) |
Depreciation and amortization | 1,180 | 76 | 2,194 | 96 |
Interest expense (income) | 3 |  | 5 | 1 |
Tax provision (benefit) |  |  | 41 |  |
Goodwill | 49,145 | 2,125 | 49,145 | 2,125 |
Total assets | 208,408 | 12,899 | 208,408 | 12,899 |
Operating Segments [Member] | Expedited Transportation [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 26,445 | 25,731 | 50,320 | 48,151 |
Operating income (loss) from operations | 1,187 | 2,634 | 1,940 | 4,422 |
Depreciation and amortization | 291 | 129 | 559 | 266 |
Interest expense (income) | 2 | 1 | 4 | 2 |
Tax provision (benefit) | 2 |  | 2 |  |
Goodwill | 11,560 | 7,737 | 11,560 | 7,737 |
Total assets | 63,303 | 28,953 | 63,303 | 28,953 |
Operating Segments [Member] | Freight Forwarding [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 19,338 | 16,468 | 35,571 | 31,925 |
Operating income (loss) from operations | 478 | 218 | 850 | 459 |
Depreciation and amortization | 93 | 145 | 181 | 289 |
Interest expense (income) |  | 1 |  |  |
Goodwill | 9,222 | 9,222 | 9,222 | 9,222 |
Total assets | 31,088 | 22,920 | 31,088 | 22,920 |
Operating Segments [Member] | Corporate [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 0 |  |  |  |
Operating income (loss) from operations | (10,690) | (5,395) | (19,362) | (11,562) |
Depreciation and amortization | 231 | 73 | 415 | 90 |
Interest expense (income) | 3,101 | 1 | 6,161 | 12 |
Tax provision (benefit) | 72 | 1,780 | 253 | 259 |
Total assets | 422,672 | 237,335 | 422,672 | 237,335 |
Operating Segments [Member] | Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | (4,052) | (1,536) | (8,391) | (2,781) |
Total assets | $ (330,992) | $ (41,376) | $ (330,992) | $ (41,376) |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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