Business Segments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Segment	Sep. 30, 2012
Segment Reporting Information [Line Items]
Number of operating business segments			2
Amortization expense	$ 580	$ 527	$ 1,672	$ 1,580
Lifting Equipment [Member]
Segment Reporting Information [Line Items]
Amortization expense	543	490	1,562	1,470
Equipment Distribution [Member]
Segment Reporting Information [Line Items]
Amortization expense	$ 37	$ 37	$ 110	$ 110