Note 9 - Segment Reporting (Detail) - Summary of Revenues, Gross Profit and Operating Income (Loss) by Geographic Region (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues	$ 265,155	$ 246,218	$ 753,281	$ 681,790
Gross profit	62,774	52,629	177,886	139,643
Operating income (loss)	26,142	9,498	55,404	22,827
United States [Member]
Revenues	164,715	147,974	480,104	398,475
Gross profit	40,218	28,094	121,651	72,129
Operating income (loss)	15,699	(2,933)	34,250	(10,621)
Canada [Member]
Revenues	47,141	46,839	130,900	127,304
Gross profit	13,352	13,225	33,995	34,430
Operating income (loss)	9,069	8,776	20,928	21,459
Europe [Member]
Revenues	21,455	26,048	62,398	78,242
Gross profit	5,332	6,895	15,107	19,523
Operating income (loss)	1,691	1,952	3,789	6,154
Other foreign [Member]
Revenues	31,844	25,357	79,879	77,769
Gross profit	3,872	4,415	7,133	13,561
Operating income (loss)	$ (317)	$ 1,703	$ (3,563)	$ 5,835