Segment Reporting (Details) $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2015
USD ($)
|
Sep. 30, 2015
USD ($)
|
Jun. 30, 2015
USD ($)
|
Mar. 31, 2015
USD ($)
|
Dec. 31, 2014
USD ($)
|
Sep. 30, 2014
USD ($)
|
Jun. 30, 2014
USD ($)
|
Mar. 31, 2014
USD ($)
|
Dec. 31, 2015
USD ($)
|
Dec. 31, 2014
USD ($)
|
Dec. 31, 2013
USD ($)
|
|
| Segment Reporting Information [Line Items] | |||||||||||
| Number of Reportable Segments | 3 | ||||||||||
| External revenues | $ 256,420 | $ 247,093 | $ 249,694 | $ 205,918 | $ 214,061 | $ 201,477 | $ 193,852 | $ 171,569 | $ 959,125 | $ 780,959 | $ 652,481 |
| Depreciation and amortization | 37,157 | 31,133 | 23,579 | ||||||||
| Other Noncash Income | 7,486 | 6,681 | 6,178 | ||||||||
| Interest expense | 2,047 | 610 | 532 | ||||||||
| Interest income | 25 | 8 | 37 | ||||||||
| Income tax expense (benefit) | 24,092 | 34,916 | 29,455 | ||||||||
| Net income (loss) | 23,228 | $ 15,687 | $ 11,824 | $ 4,836 | 17,045 | $ 16,744 | $ 17,178 | $ 10,202 | 55,575 | 61,169 | 54,467 |
| Total assets | 700,171 | 539,309 | 700,171 | 539,309 | 506,269 | ||||||
| Additions to Other Assets, Amount | 40,495 | 39,487 | 35,439 | ||||||||
| Forward Air [Member] | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| External revenues | 788,248 | 608,118 | 497,993 | ||||||||
| Revenue from Related Parties | 4,623 | 4,219 | 3,075 | ||||||||
| Depreciation and amortization | 27,069 | 21,721 | 16,222 | ||||||||
| Other Noncash Income | 7,200 | 6,470 | 5,959 | ||||||||
| Interest expense | 2,042 | 602 | 513 | ||||||||
| Interest income | 25 | 8 | 36 | ||||||||
| Income tax expense (benefit) | 21,235 | 31,792 | 26,981 | ||||||||
| Net income (loss) | 51,976 | 53,985 | 51,251 | ||||||||
| Total assets | 759,680 | 604,578 | 759,680 | 604,578 | 478,790 | ||||||
| Additions to Other Assets, Amount | 30,540 | 26,170 | 25,017 | ||||||||
| FASI [Member] | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| External revenues | 128,826 | 124,382 | 112,766 | ||||||||
| Revenue from Related Parties | 1,169 | 831 | 645 | ||||||||
| Depreciation and amortization | 6,085 | 5,811 | 4,945 | ||||||||
| Other Noncash Income | 220 | 176 | 140 | ||||||||
| Interest expense | 2 | 8 | |||||||||
| Income tax expense (benefit) | 1,673 | 2,203 | 846 | ||||||||
| Net income (loss) | 2,383 | 3,790 | 1,255 | ||||||||
| Total assets | 46,970 | 45,428 | 46,970 | 45,428 | 42,049 | ||||||
| Additions to Other Assets, Amount | 3,983 | 7,133 | 6,901 | ||||||||
| TQI [Member] | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| External revenues | 42,051 | 48,459 | 41,722 | ||||||||
| Revenue from Related Parties | 322 | 365 | 120 | ||||||||
| Depreciation and amortization | 4,003 | 3,601 | 2,412 | ||||||||
| Other Noncash Income | 66 | 35 | 79 | ||||||||
| Interest expense | 5 | 6 | 11 | ||||||||
| Interest income | 1 | ||||||||||
| Income tax expense (benefit) | 1,184 | 921 | 1,628 | ||||||||
| Net income (loss) | 1,216 | 3,394 | 1,961 | ||||||||
| Total assets | 89,312 | 88,788 | 89,312 | 88,788 | 85,490 | ||||||
| Additions to Other Assets, Amount | 5,972 | 6,184 | 3,521 | ||||||||
| Business Intersegment, Eliminations [Member] | |||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Revenue from Related Parties | (6,114) | (5,415) | (3,840) | ||||||||
| Total assets | $ (195,791) | $ (199,485) | $ (195,791) | $ (199,485) | $ (100,060) | ||||||