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Subsequent Events - Additional Information (Detail) shares in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 01, 2015 USD ($) Participants | Oct. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) shares | Sep. 30, 2015 USD ($) shares | Dec. 31, 2014 USD ($)
2010 Notes [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Common stock equivalent impact | shares |  |  | 1.6 | 1.3 |
2010 Convertible Senior Subordinated Notes [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Principal amount of notes |  |  | $ 48,373,000 | $ 48,373,000 | $ 97,650,000
Common stock equivalent impact | shares |  |  | 1.6 | 1.3 |
Subsequent Event [Member] | Pension Resource Group Inc [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Estimated revenue | $ 4,800,000 |  |  |  |
Consideration paid in cash | $ 2,000,000 |  |  |  |
Subsequent Event [Member] | Pension Resource Group Inc [Member] | Minimum [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of clients of acquired entity | Participants | 500 |  |  |  |
Subsequent Event [Member] | Pension Resource Group Inc [Member] | Maximum [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of clients of acquired entity | Participants | 60,000 |  |  |  |
Subsequent Event [Member] | 2010 Convertible Senior Subordinated Notes [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Principal amount of notes | $ 48,400,000 |  |  |  |
Conversion rate per $ 1,000 principal of convertible notes | $ 1,000 |  |  |  |
Conversion value of Notes |  | $ 71,800,000 |  |  |

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