Segment Information - Financial Information for Three Operating Segments (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]                      
Revenues $ 64,979 $ 62,636 $ 75,958 $ 85,386 $ 76,139 $ 78,252 $ 80,426 $ 84,864 $ 288,959 $ 319,681 $ 177,002
Operating Earnings                 (1,715) 5,208 12,937
Total Assets 317,985       401,423       317,985 401,423 314,267
Operating Segments [Member] | Lifting Equipment [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 172,405 193,436 158,319
Operating Earnings                 2,301 8,557 20,641
Total Assets 188,791       208,734       188,791 208,734 98,680
Operating Segments [Member] | ASV Segment [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 103,803 116,935 2,264
Operating Earnings                 6,009 5,496 (121)
Total Assets 119,732       122,672       119,732 122,672 124,146
Operating Segments [Member] | Equipment Distribution [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 16,404 13,216 21,104
Operating Earnings                 (2,893) (136) 374
Total Assets 8,742       14,585       8,742 14,585 15,612
Inter-segment Elimination [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 (3,653) (3,906) (4,685)
Operating Earnings                 274 (187) 11
Corporate [Member]                      
Segment Reporting Information [Line Items]                      
Operating Earnings                 (7,406) (8,522) (7,968)
Total Assets $ 720       2,175       $ 720 2,175 1,262
Assets of discontinued operations [Member]                      
Segment Reporting Information [Line Items]                      
Total Assets         $ 53,257         $ 53,257 $ 74,567