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Summary of Significant Accounting Policies - Revenue Recognition and Concentrations of Credit Risk - Additional Information (Detail) $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) Customer | Oct. 01, 2018 USD ($) | Dec. 31, 2017 | Sep. 30, 2019 USD ($) Customer | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) Customer | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2019 USD ($) Customer | Sep. 30, 2018 USD ($) Customer | Sep. 30, 2017 USD ($) | Oct. 01, 2019 USD ($)
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of customers with an account receivable balance of more than 10% of total accounts receivable | Customer | 1 |  |  | 1 |  |  |  | 1 |  |  |  | 1 | 1 |  |
Allowance for doubtful accounts | $ 36,121 | $ 21,211 |  | $ 36,121 |  |  |  | $ 21,211 |  |  |  | $ 36,121 | $ 21,211 |  |
Total assets | 5,292,826 |  |  | 5,292,826 |  |  |  | 5,347,815 |  |  |  | 5,292,826 | 5,347,815 |  |
Total liabilities | 1,750,360 |  |  | 1,750,360 |  |  |  | 1,855,773 |  |  |  | 1,750,360 | 1,855,773 |  |
Retained earnings | $ 5,012,799 |  |  | 5,012,799 |  |  |  | 4,673,901 |  |  |  | 5,012,799 | 4,673,901 |  |
Revenue |  |  |  | $ 1,030,253 | $ 1,024,704 | $ 1,019,657 | $ 1,012,055 | $ 1,002,588 | $ 1,002,198 | $ 992,340 | $ 977,711 | 4,086,669 | 3,974,837 | $ 3,867,155 |
Cost of revenue |  |  |  |  |  |  |  |  |  |  |  | $ 2,653,172 | $ 2,595,276 | $ 2,507,656 |
US federal [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
US federal corporate tax rate | 21.00% |  | 35.00% |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable [Member] | Customer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate account receivable of more than 10% of total accounts receivable |  |  |  |  |  |  |  |  |  |  |  | 16.00% | 19.00% |  |
Accounting Standards Update 2016-16 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in retained earnings |  | 3,860 |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  | 4,688,195 |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update 2014-09 [Member] | Adjustments due to ASC 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  | $ 14,294 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  | $ 26,096 |  |  |
Cost of revenue |  |  |  |  |  |  |  |  |  |  |  | $ (11,051) |  |  |
Accounting Standards Update 2016-02 [Member] | Scenario, Adjustment [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 260,000
Total liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 260,000
Accounting Standards Update 2016-02 [Member] | Scenario, Adjustment [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 310,000
Total liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 310,000

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