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Condensed Consolidated Financial Statements - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2017
Summary Of Significant Accounting Policies [Line Items] |  |
Amount of off balance sheet settlement funds | $ 270,000,000 | $ 223,900,000
Goodwill impairment | 0 |
Level 2 [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Fair value senior note | $ 309,800,000 | $ 305,400,000

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