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Segment Information - Revenues and Percentage of Revenues on Geographical Basis (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 253,205 | $ 230,986 | $ 228,378 | $ 219,600 | $ 235,824 | $ 238,778 | $ 206,678 | $ 200,076 | $ 932,169 | $ 881,356 | $ 838,781
United States |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 598,765 | 567,443 | 505,109
United Kingdom |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 71,989 | 86,485 | 93,855
Other countries |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 261,415 | $ 227,428 | $ 239,817
Geographic Concentration Risk | Sales Revenue |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration of risk, percentage |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Geographic Concentration Risk | United States | Sales Revenue |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration of risk, percentage |  |  |  |  |  |  |  |  | 64.00% | 64.00% | 60.00%
Geographic Concentration Risk | United Kingdom | Sales Revenue |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration of risk, percentage |  |  |  |  |  |  |  |  | 8.00% | 10.00% | 11.00%
Geographic Concentration Risk | Other countries | Sales Revenue |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration of risk, percentage |  |  |  |  |  |  |  |  | 28.00% | 26.00% | 29.00%

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