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COMMITMENTS AND CONTINGENCIES (Additional Information) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Commitments and Contingencies Disclosure [Line Items] |  |  |
Rental expense for operating leases | $ 24.2 | $ 22.6 | $ 24.2
Cash paid for data processing, outsourcing services and other agreements | $ 50.0 | $ 50.0 | $ 60.0
Severance benefit term | In the event of a qualifying termination, the executive will become entitled to continuation of group health, dental, vision, life, disability, 401(k) and similar benefits for two or three years, depending on the eligibility, as well as a lump sum severance payment, all of which differs by executive. |  |
Potential Percentage Of Stock Acquired With Change In Control | any person acquires 20% or more of our voting stock |  |
Qualifying termination, continuation of benefits for executives | 3 years |  |
Qualifying termination, continuation of benefits for executives, automatic renewal | 3 years |  |
Conditional payment for unrecognized severance benefit for key executives | $ 54.7 |  |
Assumed tax on expected payment for unrecognized severance benefit for key executives | $ 30.8 |  |
Conditional payout percentage of target award | 100.00% |  |
Guarantees |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Performance bonds and standby letters of credit remaining maturity date | one year or less. |  |
Data Processing, Outsourcing Services And Other Agreements | Minimum |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Service agreements expiration year | 2016 |  |
Estimated aggregate minimum contractual obligation | $ 35.0 |  |
Data Processing, Outsourcing Services And Other Agreements | Maximum |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Service agreements expiration year | 2023 |  |
Estimated aggregate minimum contractual obligation | $ 55.0 |  |
IBM Operations Support Services Agreement |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Service agreements expiration date |  |  | Dec. 31, 2016
IBM Operations Support Services Agreement | Minimum |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Expected future year's minimum contractual obligation | 20.0 |  |
IBM Operations Support Services Agreement | Maximum |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Expected future year's minimum contractual obligation | $ 30.0 |  |

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