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Employer Share Plans (Tables) | 6 Months Ended
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Jun. 30, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Schedule of Share-Based Compensation Awards | Compensation expense for stock-based awards recognized during the three and six months ended June 30, 2016 and 2015 was as follows (in thousands):
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Stock options |  | $ | 564 |  |  | $ | 534 |  |  | $ | 1,143 |  |  | $ | 1,375 |
Restricted stock awards |  |  | 869 |  |  |  | 755 |  |  |  | 1,699 |  |  |  | 1,536 |
Total stock-based compensation expense |  | $ | 1,433 |  |  | $ | 1,289 |  |  | $ | 2,842 |  |  | $ | 2,911 |
Stock Award Activity | Stock award activity during the six months ended June 30, 2016 was as follows (in thousands, except per share data):
|  | Stock Options |  |  | Restricted Stock Awards |
|  | Number of Options |  |  | Weighted Average Exercise Price Per Share |  |  | Number of Shares |  |  | Weighted Average Grant-Date Fair Value (1) |
Outstanding at beginning of year |  |  | 4,885 |  |  | $ | 7.50 |  |  |  | 962 |  |  | $ | 8.08 |
Granted |  |  | 654 |  |  | $ | 10.35 |  |  |  | 305 |  |  | $ | 10.37 |
Exercised or released |  |  | (510 | ) |  | $ | 6.92 |  |  |  | (426 | ) |  | $ | 7.64 |
Expired or canceled |  |  | (24 | ) |  | $ | 7.47 |  |  |  | (3 | ) |  | $ | 7.66 |
Outstanding at June 30, 2016 |  |  | 5,005 |  |  | $ | 7.94 |  |  |  | 838 |  |  | $ | 9.13 |
Exercisable at June 30, 2016 |  |  | 2,810 |  |  | $ | 7.13 |  |  |  |  |  |  |  |  |
| (1) | Represents weighted average market value of the shares; awards are granted at no cost to the recipients.
Schedule of Fair Value Option Award Weighted Average Assumptions Used | CBIZ utilized the Black-Scholes-Merton options-pricing model to determine the fair value of stock options on the date of grant. The fair value of stock options granted during the second quarter of 2016 was $2.40. The following weighted average assumptions were utilized:
|  | Six Months Ended June 30, |
Expected volatility (1) |  |  | 24.88 | %
Expected option life (years) (2) |  |  | 4.62 |
Risk-free interest rate (3) |  |  | 1.12 | %
Expected dividend yield (4) |  |  | 0.00 | %
| (1) | The expected volatility assumption was determined based upon the historical volatility of CBIZ’s stock price, using daily price intervals.
| (2) | The expected option life was determined based upon CBIZ’s historical data using a midpoint scenario, which assumes all options are exercised halfway between the expirations date and the weighted average time it takes the option to vest.
| (3) | The risk-free interest rate assumption was based upon zero-coupon U.S. Treasury bonds with a term approximating the expected life of the respective options.
| (4) | The expected dividend yield assumption was determined in view of CBIZ’s historical and estimated dividend payouts. CBIZ does not expect to change its dividend payout policy in the foreseeable future.

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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