Note 12 - Segment and Geographic Information (Detail) - Financial Information by Geographic Area (USD $) In Thousands, unless otherwise specified	3 Months Ended										12 Months Ended
	Dec. 31, 2011		Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010		Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Revenues:
Revenues	$ 256,795		$ 246,218	$ 224,985	$ 210,587	$ 246,016		$ 239,585	$ 230,192	$ 199,182	$ 938,585		$ 914,975		$ 726,866
Operating income (loss):
Operating income (loss)	21,710		9,498	7,840	5,489	24,827		26,955	22,747	12,506	44,537		87,035		49,117
Long-lived assets: (1)
Long-lived assets	202,018	[1]				196,735	[1]				202,018	[1]	196,735	[1]	187,043	[1]
United States [Member]
Revenues:
Revenues											552,197		604,372		480,684
Operating income (loss):
Operating income (loss)											(2,212)		40,172		25,004
Long-lived assets: (1)
Long-lived assets	153,853	[1]				147,572	[1]				153,853	[1]	147,572	[1]	131,447	[1]
Canada [Member]
Revenues:
Revenues											178,739		139,632		95,761
Operating income (loss):
Operating income (loss)											31,892		30,958		17,790
Long-lived assets: (1)
Long-lived assets	22,998	[1]				20,564	[1]				22,998	[1]	20,564	[1]	25,371	[1]
Europe [Member]
Revenues:
Revenues											102,471		87,616		95,910
Operating income (loss):
Operating income (loss)											9,391		9,041		(11)
Long-lived assets: (1)
Long-lived assets	12,474	[1]				13,596	[1]				12,474	[1]	13,596	[1]	21,173	[1]
Other Foreign [Member]
Revenues:
Revenues											105,178		83,355		54,511
Operating income (loss):
Operating income (loss)											5,466		6,864		6,334
Long-lived assets: (1)
Long-lived assets	$ 12,693	[1]				$ 15,003	[1]				$ 12,693	[1]	$ 15,003	[1]	$ 9,052	[1]

[1] Long lived assets as of December 31, 2011, 2010 and 2009 do not include intangible assets, goodwill or deferred tax assets.