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Acquisitions - Preliminary Purchase Price Allocation of PAY.ON (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |
Goodwill | $ 913,261 | $ 781,163 | $ 669,217
PAY.ON |  |  |
Business Acquisition [Line Items] |  |  |
Cash and cash equivalents | 1,627 |  |
Receivables, net of allowance | 2,658 |  |
Other current assets | 581 |  |
Total current assets acquired | 4,866 |  |
Property and equipment | 424 |  |
Goodwill | 140,015 |  |
Other noncurrent assets | 6 |  |
Total assets acquired | 204,442 |  |
Accounts payable | 1,125 |  |
Employee compensation | 555 |  |
Other current liabilities | 1,115 |  |
Total current liabilities acquired | 2,795 |  |
Deferred income taxes | 15,274 |  |
Total liabilities acquired | 18,069 |  |
Net assets acquired | $ 186,373 |  |
Software | PAY.ON |  |  |
Business Acquisition [Line Items] |  |  |
Acquired intangible assets, weighted-average useful lives | 5 years |  |
Amortizable intangible assets | $ 34,213 |  |
Customer relationships | PAY.ON |  |  |
Business Acquisition [Line Items] |  |  |
Acquired intangible assets, weighted-average useful lives | 15 years |  |
Amortizable intangible assets | $ 22,418 |  |
Trademarks | PAY.ON |  |  |
Business Acquisition [Line Items] |  |  |
Acquired intangible assets, weighted-average useful lives | 5 years |  |
Amortizable intangible assets | $ 2,500 |  |

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