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Business Segments (Tables) | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Reconciliation of Revenue and Operating Income by Reportable Segment to Consolidated Results | The following table provides a reconciliation of revenue and operating income by reportable segment to consolidated results (in thousands):
|  | Years Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Net service revenues |  |  |  |  |  |
Temporary and consultant staffing |  | $ | 4,011,042 |  |  | $ | 4,026,777 |  |  | $ | 3,930,843 |
Permanent placement staffing |  | 439,214 |  |  | 419,314 |  |  | 421,411 |
Risk consulting and internal audit services |  | 816,533 |  |  | 804,308 |  |  | 742,679 |
|  | $ | 5,266,789 |  |  | $ | 5,250,399 |  |  | $ | 5,094,933 |
Operating income |  |  |  |  |  |
Temporary and consultant staffing |  | $ | 355,700 |  |  | $ | 393,704 |  |  | $ | 399,808 |
Permanent placement staffing |  | 77,673 |  |  | 80,001 |  |  | 85,019 |
Risk consulting and internal audit services |  | 83,907 |  |  | 80,754 |  |  | 95,845 |
|  | 517,280 |  |  | 554,459 |  |  | 580,672 |
Amortization of intangible assets |  | 1,563 |  |  | 1,237 |  |  | 192 |
Interest income, net |  | (1,799 | ) |  | (888 | ) |  | (550 | )
Income before income taxes |  | $ | 517,516 |  |  | $ | 554,110 |  |  | $ | 581,030 |
Revenue and Long-Lived Assets by Geographic Location | The following tables represent revenues and long-lived assets by geographic location (in thousands):
|  | Years Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Net service revenues (a) |  |  |  |  |  |
Domestic |  | $ | 4,121,701 |  |  | $ | 4,220,477 |  |  | $ | 4,105,013 |
Foreign (b) |  | 1,145,088 |  |  | 1,029,922 |  |  | 989,920 |
|  | $ | 5,266,789 |  |  | $ | 5,250,399 |  |  | $ | 5,094,933 |
|  | December 31,
|  | 2017 |  | 2016 |  | 2015
Assets, long-lived |  |  |  |  |  |
Domestic |  | $ | 113,069 |  |  | $ | 136,434 |  |  | $ | 117,176 |
Foreign |  | 31,818 |  |  | 25,075 |  |  | 25,730 |
|  | $ | 144,887 |  |  | $ | 161,509 |  |  | $ | 142,906 |
(a) There were no customers that accounted for more than 10% of the Company’s total net revenue in any year presented. (b) No individual country represented more than 10% of revenues in any year presented.

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- Definition Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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