Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 305,928us-gaap_NetIncomeLoss	$ 252,195us-gaap_NetIncomeLoss	$ 209,942us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of intangible assets	557us-gaap_AmortizationOfIntangibleAssets	1,700us-gaap_AmortizationOfIntangibleAssets	398us-gaap_AmortizationOfIntangibleAssets
Depreciation expense	49,124us-gaap_Depreciation	47,072us-gaap_Depreciation	48,326us-gaap_Depreciation
Stock-based compensation expense—restricted stock and stock units	40,821us-gaap_RestrictedStockExpense	38,867us-gaap_RestrictedStockExpense	41,464us-gaap_RestrictedStockExpense
Excess tax benefits from stock-based compensation	(7,174)	(8,103)	(8,475)
Deferred income taxes	(3,643)us-gaap_DeferredIncomeTaxExpenseBenefit	(13,259)us-gaap_DeferredIncomeTaxExpenseBenefit	(14,993)us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for doubtful accounts	9,825us-gaap_ProvisionForDoubtfulAccounts	7,467us-gaap_ProvisionForDoubtfulAccounts	7,133us-gaap_ProvisionForDoubtfulAccounts
Changes in assets and liabilities, net of effects of acquisitions:
Increase in accounts receivable	(134,917)	(47,699)	(21,354)
Increase in accounts payable, accrued expenses, accrued payroll and benefit costs	71,740	38,356	16,672
Increase (decrease) in income taxes payable	16,359	(11,927)	15,160
Change in other assets, net of change in other liabilities	(7,922)	4,548	(5,096)
Net cash flows provided by operating activities	340,698	309,217	289,177
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments for acquisitions, net of cash acquired	0	0	(14,393)
Capital expenditures	(62,830)	(53,725)	(50,056)
Payments to trusts for employee deferred compensation plans	(25,811)	(44,052)	(8,577)
Net cash flows used in investing activities	(88,641)	(97,777)	(73,026)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repurchases of common stock	(153,821)	(167,975)	(176,794)
Cash dividends paid	(97,604)us-gaap_PaymentsOfDividends	(89,187)us-gaap_PaymentsOfDividends	(84,129)us-gaap_PaymentsOfDividends
Decrease in notes payable and other indebtedness	(128)us-gaap_ProceedsFromRepaymentsOfDebt	(4,496)us-gaap_ProceedsFromRepaymentsOfDebt	(107)us-gaap_ProceedsFromRepaymentsOfDebt
Excess tax benefits from stock-based compensation	7,174	8,103	8,475
Proceeds from exercises of stock options	14,324	33,285	42,939
Net cash flows used in financing activities	(230,055)	(220,270)	(209,616)
Effect of exchange rate changes on cash and cash equivalents	(10,647)	(3,041)	1,764
Net increase (decrease) in cash and cash equivalents	11,355	(11,871)	8,299
Cash and cash equivalents at beginning of period	275,764	287,635	279,336
Cash and cash equivalents at end of period	287,119	275,764	287,635
Cash paid during the year for:
Interest	330us-gaap_InterestPaid	315us-gaap_InterestPaid	405us-gaap_InterestPaid
Income taxes, net of refunds	178,375us-gaap_IncomeTaxesPaidNet	168,407us-gaap_IncomeTaxesPaidNet	136,023us-gaap_IncomeTaxesPaidNet
Non-cash items:
Stock repurchases awaiting settlement	$ 30,152rhi_ShareRepurchasesAwaitingSettlement	$ 0rhi_ShareRepurchasesAwaitingSettlement	$ 5,942rhi_ShareRepurchasesAwaitingSettlement

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

+ References

+ Details

Name:	us-gaap_RestrictedStockExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration