Acquisitions - Schedule of Pro-forma Adjustments (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Business Combinations [Abstract]
Record interest expense on Manitex debt issued in connection with the acquisition	$ 500	$ 33	$ 1,494
Transfer transaction costs incurred between periods		(1,148)	1,148
Eliminate impact of capitalizing Research and Development by PM	(211)	(45)	225
Adjust depreciation to reflect fair values and current lives	(147)	(11)	(387)
Adjust amortization to reflect fair value on intangible assets and current lives	551	90	1,684
Eliminate historic interest expense on debt forgiven or converted to non-interest debt	(177)	(14)	(1,169)
Record amortization of debt discount on non-interest bearing debt	105	27	387
Transfer amortization of inventory step up between periods		(912)	1,030
Eliminate profit on debt restructuring (this was not a taxable event)		6,298
Record income tax impact on the above pro forma adjustments	$ (213)	$ 662	$ (1,481)