BUSINESS COMBINATION (Details) $ / shares in Units, $ in Thousands		3 Months Ended	12 Months Ended
	Feb. 27, 2017 USD ($) $ / shares shares	Mar. 31, 2017 USD ($) item shares	Dec. 31, 2017 USD ($)	Dec. 31, 2016 shares
Common stock shares issued	37,715,960	37,715,960		37,715,960
Common stock shares outstanding		37,715,960		37,715,960
Proceeds from Issuance of Convertible Preferred Stock | $		$ 65,000
Term loan facility
Credit facility | $	$ 250,000
Delayed Draw Feature
Credit facility | $	100,000
ABL Member
Credit facility | $	$ 70,000
Minimum
Earn out target ( as a percent)	90.00%
Maximum
Earn out target ( as a percent)	100.00%
Private placement
Common stock shares issued	419,669
Senior Debt
Credit facility | $	$ 350,000
Hennessy Capital Acquisition Corp II and HCAC Merger Sub Inc
Common stock shares outstanding	37,715,960	8,342,918
Proceeds from Issuance of Convertible Preferred Stock | $	$ 65,000
Hennessy Capital Acquisition Corp II and HCAC Merger Sub Inc | IPO
Common stock shares issued	8,342,918
Hennessy Capital Acquisition Corp II and HCAC Merger Sub Inc | Private placement
Common stock shares issued	2,288,043
Hennessy Capital Acquisition Corp II and HCAC Merger Sub Inc | Series A Convertible Preferred Stock Member
Proceeds from Issuance of Convertible Preferred Stock | $		$ 65,000
Issuance of Series A Convertible Preferred Stock ( in shares)		650,000
Hennessy Capital Acquisition Corp II and HCAC Merger Sub Inc | Series A Convertible Preferred Stock Member | Private placement
Proceeds from Issuance of Convertible Preferred Stock | $	$ 65,000
Issuance of Series A Convertible Preferred Stock ( in shares)	650,000
Hennessy Capital Acquisition Corp II and HCAC Merger Sub Inc | Earn out provision
Adjusted EBITDA | $			$ 140,000
Number of trading days | item		20
Number of consecutive trading days		30 days
Hennessy Capital Acquisition Corp II and HCAC Merger Sub Inc | Earn out provision | Minimum
Adjusted EBITDA - 2017 | $	$ 140,000
Adjusted EBITDA - 2018 | $	170,000
Adjusted EBITDA - 2019 | $	$ 200,000
Share price - 2017 | $ / shares	$ 12.00
Share price - 2018 | $ / shares	14.00
Share price - 2019 | $ / shares	$ 16.00
Hennessy Capital Acquisition Corp II and HCAC Merger Sub Inc | Earn out provision | Maximum
Shares payable annually in 2018	5,000,000
Shares payable annually in 2019	5,000,000
Private Daseke [Member]
Purchase price paid in common stock (in shares)	26,665,330
Shares issued to former Daseke stockholders	26,665,330
Private Daseke [Member] | Hennessy Capital Acquisition Corp II and HCAC Merger Sub Inc
Consideration received upon closing | $	$ 266,700
Value per share issued | $ / shares	$ 10.00
Private Daseke [Member] | Hennessy Capital Acquisition Corp II and HCAC Merger Sub Inc | Earn out provision | Maximum
Shares to be issued under earn-out provision	15,000,000
Shares payable annually in 2017	5,000,000