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Goodwill and Other Intangible Assets, Net (Tables) | 12 Months Ended
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Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract] |
Components of Goodwill and Other Intangible Assets, Net | The components of goodwill and other intangible assets, net at December 31, 2015 and 2014 were as follows (in thousands):
|  | 2015 |  |  | 2014 |
Goodwill |  | $ | 447,685 |  |  | $ | 435,231 |
Intangibles: |  |  |  |  |  |  |  |
Client lists |  |  | 147,706 |  |  |  | 140,187 |
Other intangibles |  |  | 6,977 |  |  |  | 6,482 |
Total intangibles |  |  | 154,683 |  |  |  | 146,669 |
Total goodwill and other intangibles assets |  |  | 602,368 |  |  |  | 581,900 |
Accumulated amortization: |  |  |  |  |  |  |  |
Client lists |  |  | (65,037 | ) |  |  | (54,213 | )
Other intangibles |  |  | (1,678 | ) |  |  | (1,225 | )
Total accumulated amortization |  |  | (66,715 | ) |  |  | (55,438 | )
Goodwill and other intangible assets, net |  | $ | 535,653 |  |  | $ | 526,462 |
Changes in Carrying Amount of Goodwill by Operating Segment | Changes in the carrying amount of goodwill by operating segment for the years ended December 31, 2015 and 2014 were as follows (in thousands):
|  | Financial Services |  |  | Employee Services |  |  | National Practices |  |  | Total Goodwill |
December 31, 2013 |  | $ | 260,715 |  |  | $ | 122,316 |  |  | $ | 1,666 |  |  | $ | 384,697 |
Additions |  |  | 9,452 |  |  |  | 42,619 |  |  |  | — |  |  |  | 52,071 |
Divestitures |  |  | (1,537 | ) |  |  | — |  |  |  | — |  |  |  | (1,537 | )
December 31, 2014 |  | $ | 268,630 |  |  | $ | 164,935 |  |  | $ | 1,666 |  |  | $ | 435,231 |
Additions |  |  | 409 |  |  |  | 13,599 |  |  |  | — |  |  |  | 14,008 |
Divestitures |  |  | (1,554 | ) |  |  | — |  |  |  | — |  |  |  | (1,554 | )
December 31, 2015 |  | $ | 267,485 |  |  | $ | 178,534 |  |  | $ | 1,666 |  |  | $ | 447,685 |
Amortization Expense Related to Client Lists and Other Intangible Assets | Amortization expense related to client lists and other intangible assets for the years ended December 31, 2015, 2014 and 2013 was as follows (in thousands):
|  | 2015 |  |  | 2014 |  |  | 2013 |
Operating expenses |  | $ | 14,714 |  |  | $ | 14,462 |  |  | $ | 13,520 |
Corporate general and administrative expenses |  |  | 17 |  |  |  | 16 |  |  |  | 15 |
Total amortization expense |  | $ | 14,731 |  |  | $ | 14,478 |  |  | $ | 13,535 |
Amortization Expense for Existing Client Lists and Other Intangible Assets | Amortization expense for existing client lists and other intangible assets for each of the next five years ending December 31 is estimated to be (in thousands):
2016 |  | $ | 14,871 |
2017 |  | $ | 14,410 |
2018 |  | $ | 13,360 |
2019 |  | $ | 9,376 |
2020 |  | $ | 8,306 |

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