Note 9 - Segment Reporting (Detail) - Summary of Revenues, Gross Profit and Operating Income (Loss) by Geographic Region (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues:
Revenues	$ 224,985	$ 230,192	$ 435,572	$ 429,374
Gross profit:
Gross profit	45,840	59,199	87,014	107,880
Operating income (loss):
Operating income (loss)	7,840	22,747	13,329	35,254
United States [Member]
Revenues:
Revenues	136,819	157,867	250,501	288,154
Gross profit:
Gross profit	25,202	38,260	44,034	70,225
Operating income (loss):
Operating income (loss)	(1,521)	11,666	(7,689)	17,020
Canada [Member]
Revenues:
Revenues	35,484	28,982	80,465	60,498
Gross profit:
Gross profit	9,396	9,923	21,205	18,697
Operating income (loss):
Operating income (loss)	4,934	6,251	12,683	11,267
Europe [Member]
Revenues:
Revenues	27,847	20,926	52,195	41,764
Gross profit:
Gross profit	7,201	5,794	12,629	11,009
Operating income (loss):
Operating income (loss)	2,899	2,039	4,202	3,586
Otherforeign [Member]
Revenues:
Revenues	24,835	22,417	52,411	38,958
Gross profit:
Gross profit	4,041	5,222	9,146	7,949
Operating income (loss):
Operating income (loss)	$ 1,528	$ 2,791	$ 4,133	$ 3,381