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Summary of Significant Accounting Policies - Additional Information (Detail) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Feb. 08, 2017 USD ($) | Dec. 31, 2017 USD ($) Segment $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($)
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |
Number of operating segments | Segment |  |  |  | 1 |  |
Interest costs incurred |  |  |  | $ 1,700,000 | $ 1,300,000 | $ 1,300,000
Interest costs capitalized |  |  |  | 800,000 | 400,000 |
Total capitalized payroll costs related to internal use software projects |  |  |  | 15,800,000 | 8,800,000 |
Amortization expense related to capitalized software costs |  |  |  | 7,000,000 | 3,600,000 | 1,800,000
Goodwill impairment amount |  | $ 0 |  | 0 | 0 | 0
Impairment of intangible assets with finite lives |  |  |  | 0 | 0 | 0
Impairment of long-lived assets |  |  |  | $ 0 | 0 | 0
Conversion fees, deferred revenue recognition period |  |  |  | 10 years |  |
Advertising costs |  |  |  | $ 7,900,000 | 4,900,000 | 3,600,000
Sales taxes |  |  |  | $ 5,000,000 | $ 4,300,000 | 3,700,000
Stock Repurchase Plan [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |
Stock repurchase plan expiration date | Oct. 30, 2019 |  | Jan. 31, 2019 |  |  |
Stock repurchase plan period | 24 months |  |  |  |  |
Number of common stocks repurchased during the period | shares |  |  |  | 1,238,577 | 1,112,261 |
Stock repurchased, average costs per share | $ / shares |  |  |  | $ 72.45 | $ 44.52 |
Stock Repurchase Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |
Shares withheld to satisfy tax withholding obligations | shares |  |  |  | 464,302 | 302,424 |
Internal use Software [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |
Capitalized and amortized period |  |  |  | 3 years |  |
Customer Relationships [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |
Capitalized and amortized period |  |  |  |  | 6 months |
Expected period of client relationships |  |  |  | 10 years |  |
Maximum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |
Interest costs capitalized |  |  |  |  |  | $ 100,000
Maximum [Member] | Stock Repurchase Plan [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |
Stock repurchase plan, authorization amount | $ 75,000,000 |  | $ 50,000,000 |  |  |

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