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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Aug. 30, 2018 | Jan. 01, 2018
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Maximum allocation period (in year) |  | 1 year |  |  |  |  |
Capitalized computer software costs |  | $ 37,300,000 |  | $ 37,400,000 | $ 33,100,000 |  |
Capitalized computer software amortization expense |  | $ 24,200,000 |  | 21,800,000 | 17,700,000 |  |
Minimum percentage of likelihood required to recognize uncertain income tax position |  | 50.00% |  |  |  |  |
Provisional income tax benefit due to corporate rate reduction | $ 202,900,000 | $ 202,500,000 |  | 210,000,000 |  |  |
Provisional income tax expense (benefit) |  | $ (103,700,000) |  | (128,200,000) |  |  |
Maturity of cash equivalent, max (in months) |  | 3 months |  |  |  |  |
Foreign exchange gain (loss) recognized |  | $ (100,000) |  | (200,000) | (2,800,000) |  |
Foreign currency losses on long-term intra-entity transactions |  | 79,600,000 |  |  |  |  |
Advertising expense |  | 26,300,000 |  | 26,100,000 | $ 22,200,000 |  |
Retained earnings |  | 3,817,656,000 | [1] | 2,958,921,000 |  |  |
Prepaid expenses and other current assets |  | 199,278,000 | [1] | 187,820,000 |  |  |
Other assets |  | 147,632,000 | [1] | 114,962,000 |  |  |
Deferred income taxes |  | 491,946,000 | [1] | 518,912,000 |  |  |
Deferred tax assets, net |  | 91,868,000 |  | 81,839,000 |  |  |
Term Loan |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Deferred financing costs |  | 10,900,000 |  | 11,800,000 |  |  |
Revolving Credit Facility and Securitization Facility |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Deferred financing costs |  | 10,400,000 |  | 16,300,000 |  |  |
Securitization Facility |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Securitized accounts receivable facility |  |  |  |  |  | $ 1,200,000,000 |
Securitization Facility | Second Amendment |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Securitized accounts receivable facility |  | 1,200,000,000 |  |  |  |  |
New Credit Facility |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Payments of debt issuance costs |  | $ 4,900,000 |  | $ 12,900,000 |  |  |
Minimum | Stock options |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Period of vesting provisions (in years) |  | 1 year |  |  |  |  |
Minimum | Restricted Stock And Restricted Stock Units |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Period of vesting provisions (in years) |  | 1 year |  |  |  |  |
Maximum |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Customer payment terms (in days) |  | 14 days |  |  |  |  |
Term of derivative contract |  | 1 year |  |  |  |  |
Maximum | Stock options |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Period of vesting provisions (in years) |  | 5 years |  |  |  |  |
Maximum | Restricted Stock And Restricted Stock Units |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Period of vesting provisions (in years) |  | 3 years |  |  |  |  |
Customer Concentration Risk |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Period past due for accounts receivable deemed as uncollectible |  | 90 days |  |  |  |  |
Period past due for allowance of trade accounts receivable maximum |  | 90 days |  |  |  |  |
Customer Concentration Risk | Accounts Receivable |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Concentration risk, percentage |  | 99.00% |  | 96.00% |  |  |
Accounting Standards Update 2016-15 |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  | $ 17,100,000
Deferred tax assets, net |  |  |  |  |  |  | 25,900,000
Prepaid taxes |  |  |  |  |  |  | 8,800,000
Impact of ASC 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  | 30,200,000
Prepaid expenses and other current assets |  |  |  |  |  |  | 10,200,000
Other assets |  |  |  |  |  |  | 30,300,000
Deferred income taxes |  |  |  |  |  |  | $ 10,300,000
[1] | Reflects the impact of the Company's adoption of ASC 606 and related cost capitalization guidance, which was adopted by the Company on January 1, 2018 using the modified retrospective transition method. The adoption of ASC 606 resulted in an adjustment to retained earnings in our consolidated balance sheet for the cumulative effect of applying the standard, which included costs incurred to obtain a contract, as well as presentation changes in our statements of income, including the classification of certain amounts previously classified as merchant commissions and processing expense net with revenues. As a result of the application of the modified retrospective transition method, the Company's prior period results within its Form 10-K and quarterly reports on Form 10-Q will not be restated to reflect ASC 606.

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