Business Segments (Tables)

12 Months Ended

Dec. 31, 2011

Business Segments [Abstract]

Business Segments

	Years Ended December 31,
	2011			2010			2009
Net service revenues
Temporary and consultant staffing	$	3,050,999		$	2,568,255		$	2,471,132
Permanent placement staffing		302,155			221,219			181,856
Risk consulting and internal audit services		423,822			385,619			383,559
	$	3,776,976		$	3,175,093		$	3,036,547
Operating income (loss)
Temporary and consultant staffing	$	209,101		$	108,443		$	104,521
Permanent placement staffing		35,340			17,502			(6,973	)
Risk consulting and internal audit services		4,977			(10,945	)		(30,768	)
		249,418			115,000			66,780
Amortization of intangible assets		153			411			1,460
Interest income, net		(951	)		(579	)		(1,443	)
Income before income taxes	$	250,216		$	115,168		$	66,763

Identifiable Assets By Business Segment

	December 31,
	2011		2010		2009
Accounts receivable
Temporary and consultant staffing	$	342,122	$	296,722	$	257,918
Permanent placement staffing		75,333		59,952		43,815
Risk consulting and internal audit services		98,499		88,070		82,082
	$	515,954	$	444,744	$	383,815
	December 31,
	2011		2010		2009
Goodwill
Temporary and consultant staffing	$	134,507	$	134,653	$	134,780
Permanent placement staffing		26,545		26,568		26,579
Risk consulting and internal audit services		28,371		28,566		27,977
	$	189,423	$	189,787	$	189,336

Revenues And Long-Lived Assets By Geographic Location

	Years Ended December 31,
	2011		2010		2009
Net service revenues
Domestic	$	2,655,443	$	2,263,316	$	2,161,826
Foreign		1,121,533		911,777		874,721
	$	3,776,976	$	3,175,093	$	3,036,547
	December 31,
	2011		2010		2009
Assets, long-lived
Domestic	$	87,146	$	86,689	$	101,034
Foreign		20,826		16,962		23,624
	$	107,972	$	103,651	$	124,658