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Goodwill and Other Intangible Assets, Net - Changes in Carrying Amount of Goodwill by Operating Segment (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | $ 375,122 | $ 317,434
Additions | 9,575 | 57,688
Goodwill | 384,697 | 375,122
Financial Services [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | 259,038 | 233,163
Additions | 1,677 | 25,875
Goodwill | 260,715 | 259,038
Employee Services [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | 114,418 | 82,605
Additions | 7,898 | 31,813
Goodwill | 122,316 | 114,418
National Practices [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | 1,666 | 1,666
Additions |  |
Goodwill | $ 1,666 | $ 1,666

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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