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Incentive Award Plan and Employee Stock Purchase Plan | 6 Months Ended
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Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Incentive Award Plan and Employee Stock Purchase Plan | Incentive Award Plan and Employee Stock Purchase Plan. On January 2, 2014, the Chief Executive Officer (the "CEO") was awarded 23,255 performance-based restricted stock units ("RSUs") with a grant date fair market value of $0.8 million, which will vest on January 4, 2015, contingent upon the Company achieving certain financial performance objectives based on Adjusted EBITDA (earnings before interest, taxes, depreciation, and amortization of identifiable intangible assets, but excluding gains, losses or expenses associated with unusual items such as equity-based compensation expense, impairment charges and acquisition, integration and strategic planning expenses) during 2014. On March 26, 2014, the CEO was awarded 91,569 performance-based RSUs with a grant date fair market value of $3.3 million, which will vest in three equal annual increments on January 4, 2015, January 4, 2016 and January 4, 2017, conting ent upon the Company achieving certain financial performance objectives based on Adjusted EBITDA during 2014. On March 26, 2014, the CEO was awarded a performance-based award which had a grant date fair market value of $0.5 million, which will vest on January 2, 2015, contingent upon the Company meeting certain financial performance objectives during 2014. The Company classifies this award as a liability award until the number of shares is determined on the settlement date, by dividing $0.5 million by the closing price of the Company’s stock on the settlement date. The gra nt date fair market value of the RSUs described in this paragraph is expensed over the vesting term, based on an estimate of the percentage achievement of the applicable performance targets. All awards are subject to the CEO’s continued employment through applicable vesting dates. All awards may vest on an accelerated basis in part or in full upon the occurrence of certain events. On March 26, 2014, the Company granted 60,244 performance-based RSU grants to certain Apex employees with an aggregate grant date fair value of $2.2 million, which vest, if the performance objective is attained, in 12 equal installments beginning on April 1, 2015 and quarterly thereafter, subject to continued employment through each vesting date. Compensation expense for the performance-based component of these awards is recognized over the vesting period, based on an estimate of the percentage achievement of the targets for these awards. On March 26, 2014, May 15, 2014 and June 16, 2014, the Company granted 27,141, 16,596 and 976 performance-based RSUs, respectively, to certain other executive officers with an aggregate grant date fair value of $1.0 million, $0.6 million and $35,000, respectively. The March 26, 2014 grants will vest on January 2, 2015, and the May 15, 2014 and June 16, 2014 grants will vest on May 15, 2015, subject to continued employment and the Company attaining certain performance objectives during 2014, as approved by the Compensation Committee. Compensation expense for the performance-based component of these awards is recognized over the vesting period, based on an estimate of the percentage achievement of the targets for these awards. On March 31, 2014, the Company i ssued 90,837 shares of common stock under the On Assignment 2010 Employee Stock Purchase Plan (the "ESPP"). Compensation expense related to stock-based compensation, including the ESPP, was $4.1 million and $3.5 million for the three months ended June 30, 2014 and 2013, respectively. Compensation expense related to stock-based compensation, including the ESPP, w as $7.3 million and $6.0 million for the six months ended June 30, 2014 and 2013, respectively. Stock-based compensation is included in the Condensed Consolidated Statements of Operations and Comprehensive Income in selling, general and administrative expenses.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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