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Acquisitions - Purchase Price Allocation, in Connection with Acquisitions (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |
Goodwill | $ 773,260 | $ 781,163
Retail Decisions [Member] |  |
Business Acquisition [Line Items] |  |
Cash and cash equivalents | 795 |
Billed and accrued receivables, net | 10,106 |
Deferred income taxes, net | 514 |
Other current assets | 10,282 |
Total current assets acquired | 21,697 |
Property and equipment | 3,354 |
Goodwill | 137,915 |
Deferred income taxes | 51 |
Other noncurrent assets | 416 |
Total assets acquired | 251,029 |
Accounts payable | 4,624 |
Employee compensation | 6,046 |
Other current liabilities | 11,683 |
Total current liabilities acquired | 22,353 |
Deferred income taxes | 23,427 |
Other noncurrent liabilities | 164 |
Total liabilities acquired | 45,944 |
Net assets acquired | 205,085 |
Software [Member] | Retail Decisions [Member] |  |
Business Acquisition [Line Items] |  |
Amortizable intangible assets | $ 33,136 |
Software [Member] | Retail Decisions [Member] | Minimum [Member] |  |
Business Acquisition [Line Items] |  |
Acquired intangible assets, weighted-average useful lives | 5 years |
Software [Member] | Retail Decisions [Member] | Maximum [Member] |  |
Business Acquisition [Line Items] |  |
Acquired intangible assets, weighted-average useful lives | 7 years |
Customer relationships [Member] | Retail Decisions [Member] |  |
Business Acquisition [Line Items] |  |
Acquired intangible assets, weighted-average useful lives | 18 years |
Amortizable intangible assets | $ 50,480 |
Trademarks [Member] | Retail Decisions [Member] |  |
Business Acquisition [Line Items] |  |
Acquired intangible assets, weighted-average useful lives | 5 years |
Amortizable intangible assets | $ 3,980 |

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