CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating activities:
Net income and comprehensive income	$ 3,522us-gaap_NetIncomeLoss	$ 3,353us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization of property and equipment	8,163us-gaap_DepreciationAndAmortization	8,003us-gaap_DepreciationAndAmortization
Amortization of intangible assets	5,077us-gaap_AmortizationOfIntangibleAssets	5,147us-gaap_AmortizationOfIntangibleAssets
Amortization of deferred financing costs	521us-gaap_AmortizationOfFinancingCosts	521us-gaap_AmortizationOfFinancingCosts
Stock-based compensation expense	3,245us-gaap_ShareBasedCompensation	2,940us-gaap_ShareBasedCompensation
Excess tax benefit from exercised stock options	(1,448)	(854)
Deferred income taxes	(226)us-gaap_DeferredIncomeTaxExpenseBenefit	(967)us-gaap_DeferredIncomeTaxExpenseBenefit
Allowance for doubtful accounts and bad debt write-offs	229	(4,159)
Loss on disposal of fixed assets	10
Change in fair value of contingent consideration		6
Changes in operating assets and liabilities
Accounts receivable	(10,205)	(490)
Prepaid expenses	(983)	1,292
Prepaid income taxes	2,049us-gaap_IncreaseDecreaseInPrepaidTaxes	2,829us-gaap_IncreaseDecreaseInPrepaidTaxes
Other current assets	51	(42)
Other assets	(147)	(125)
Accounts payable, accrued expenses and other liabilities	(10,772)	(3,057)
Estimated liability for appeals	819	6,927
Net cash provided by (used in) operating activities	(95)	21,324
Investing activities:
Purchases of land, property and equipment	(2,513)	(4,208)
Investment in capitalized software	(721)us-gaap_PaymentsForSoftware	(649)us-gaap_PaymentsForSoftware
Net cash used in investing activities	(3,234)	(4,857)
Financing activities:
Repayment of revolving credit facility		(35,000)
Proceeds from exercise of stock options	3,273	2,532
Excess tax benefit from exercised stock options	1,448	854
Payments of tax withholdings on behalf of employees for net-share settlement for restricted stock awards and units	(596)	(1,088)
Payments on capital lease obligations	(366)	(413)
Payments on contingent consideration		(428)hmsy_PaymentsOnContingentConsideration
Net cash provided by (used in) financing activities	3,759	(33,543)
Net increase (decrease) in cash and cash equivalents	430	(17,076)
Cash and cash equivalents at beginning of period	133,116	93,366
Cash and cash equivalents at end of period	133,546	76,290
Supplemental disclosure of cash flow information:
Cash paid for income taxes	656us-gaap_IncomeTaxesPaid	419us-gaap_IncomeTaxesPaid
Cash paid for interest	2,826us-gaap_InterestPaid	1,188us-gaap_InterestPaid
Supplemental disclosure of noncash activities:
Accrued property and equipment purchases	959	584
Decrease in appeals liability for lost appeals offset with a reduction in accounts receivable	$ 632	$ 13,772

The decrease in appeals liability for lost appeals offset with a reduction in accounts receivable.

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Amount of increase (decrease) in the allowance for doubtful accounts.

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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The increase (decrease) during the reporting period in other assets used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets, other noncurrent assets, or a combination of other current and noncurrent assets.

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The increase (decrease) during the reporting period in the value of prepaid expenses and other assets not separately disclosed in the statement of cash flows, for example, deferred expenses, intangible assets, or income taxes.

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Amount of increase (decrease) of consideration paid in advance for income and other taxes that provide economic benefits in future periods.

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The amount of cash paid for interest during the period.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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-Name Accounting Standards Codification

-Glossary Financing Activities

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-Name Accounting Standards Codification

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The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).

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The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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