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Nature of Business and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Payments for partnership dissolved |  |  |  | $ 1,391
Percentage of receivables as of December 31, 2015, 2014 |  | No customer accounted for more than 10% of the Company's consolidated receivables balance as of December 31, 2016 or 2015. |  |
Amount of off balance sheet settlement funds |  | $ 270,000 | $ 260,200 |
Goodwill measurement period |  | 1 year |  |
Increase to net cash provided by operating activities |  | $ 99,830 | 187,994 | 160,833
Increase to net cash used in financing activities |  | (251,076) | 44,640 | 66,275
Cumulative-effect adjustment to retained earnings, net of tax |  | $ (99) |  |
Adjustments for New Accounting Pronouncement [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Increase to net cash provided by operating activities |  |  | 4,900 | 11,800
Increase to net cash used in financing activities |  |  | $ 4,900 | 11,800
Cumulative-effect adjustment to retained earnings, net of tax | $ 700 |  |  |
Cumulative-effect adjustment to retained earnings, tax | $ 400 |  |  |
Minimum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful life |  | 3 years |  |
Maximum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful life |  | 20 years |  |
Software Acquired or Developed for Internal Use | Minimum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful life |  | 3 years |  |
Software Acquired or Developed for Internal Use | Maximum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful life |  | 10 years |  |
Cornastone Technology Investments (Proprietary) Limited |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Payments for partnership dissolved |  |  |  | $ 1,500

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- Definition Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6327-108592 + Details
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