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Cash, Cash Equivalents and Marketable Securities (Details) (USD $) | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2012
Overnight Holdings |  |  |  |
Money market funds (cash equivalents) | $ 123,800,000 | $ 192,040,000 |  |
Investment Holdings |  |  |  |
Money market funds (cash equivalents) | 43,427,000 | 42,913,000 |  |
Marketable securities | 45,953,000 | 46,340,000 |  |
Total cash equivalents and marketable securities | 213,180,000 | 281,293,000 |  |
Cash held in demand accounts | 20,778,000 | 23,054,000 |  |
Outstanding checks | (8,547,000) | (32,252,000) |  |
Total cash, cash equivalents and marketable securities | 225,411,000 | 272,095,000 |  |
Cash and cash equivalents | 179,458,000 | 225,755,000 | 161,842,000 | 264,544,000
Marketable securities | 45,953,000 | 46,340,000 |  |
Withholding associated with federal and state income taxes, employment taxes and other payroll deductions included in cash balance | 90,800,000 | 143,000,000 |  |
Client prepayments included in cash balance | 18,300,000 | 24,500,000 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Municipal bonds | 45,953,000 | 46,340,000 |  |
Available-for-sale marketable securities [Abstract] |  |  |  |
Amortized Cost | 45,912,000 | 46,290,000 |  |
Gross Unrealized Gains | 45,000 | 51,000 |  |
Gross Unrealized Losses | (4,000) | (1,000) |  |
Municipal bonds | 45,953,000 | 46,340,000 |  |
Contractual maturities amortized cost [Abstract] |  |  |  |
Less than one year | 14,503,000 |  |  |
One to five years | 31,409,000 |  |  |
Amortized Cost | 45,912,000 |  |  |
Contractual maturities estimated fair value [Abstract] |  |  |  |
Less than one year | 14,519,000 |  |  |
One to five years | 31,434,000 |  |  |
Municipal bonds | 45,953,000 | 46,340,000 |  |
Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Money market funds | 167,227,000 | 234,953,000 |  |
Municipal bonds | 0 | 0 |  |
Total | 167,227,000 | 234,953,000 |  |
Available-for-sale marketable securities [Abstract] |  |  |  |
Municipal bonds | 0 | 0 |  |
Contractual maturities estimated fair value [Abstract] |  |  |  |
Municipal bonds | 0 | 0 |  |
Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Money market funds | 0 | 0 |  |
Municipal bonds | 45,953,000 | 46,340,000 |  |
Total | 45,953,000 | 46,340,000 |  |
Available-for-sale marketable securities [Abstract] |  |  |  |
Municipal bonds | 45,953,000 | 46,340,000 |  |
Contractual maturities estimated fair value [Abstract] |  |  |  |
Municipal bonds | 45,953,000 | 46,340,000 |  |
Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Money market funds | 0 | 0 |  |
Municipal bonds | 0 | 0 |  |
Total | 0 | 0 |  |
Available-for-sale marketable securities [Abstract] |  |  |  |
Municipal bonds | 0 | 0 |  |
Contractual maturities estimated fair value [Abstract] |  |  |  |
Municipal bonds | 0 | 0 |  |
Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Money market funds | 167,227,000 | 234,953,000 |  |
Municipal bonds | 45,953,000 | 46,340,000 |  |
Total | 213,180,000 | 281,293,000 |  |
Available-for-sale marketable securities [Abstract] |  |  |  |
Municipal bonds | 45,953,000 | 46,340,000 |  |
Contractual maturities estimated fair value [Abstract] |  |  |  |
Municipal bonds | $ 45,953,000 | $ 46,340,000 |  |

X
- Definition Cash equivalents include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Marketable securities include: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale which are intended to be held for less than one year or the normal operating cycle, whichever is longer. + References No definition available. + Details
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- Definition Includes currency on hand, demand deposits with banks or financial institutions and marketable securities. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. + References No definition available. + Details
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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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