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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 12, 2018 | Jun. 30, 2019 | May 01, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |
Fair value of common stock repurchased |  | $ 497,572 |  |  | $ 477,572 |
Common Stock, Shares, Outstanding |  |  |  |  | 279,583,006 | 281,455,959
Common Stock, Shares Authorized |  |  |  |  | 560,000,000 | 560,000,000
Common Stock, Par or Stated Value Per Share |  |  |  |  | $ 0.10 | $ 0.10
Second Accelerated Share Repurchase Agreement [Member] |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |
Shares repurchased, authorized amount |  |  |  |  | $ 100,000 |
Accelerated Share Repurchase Agreement [Member] |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |
Fair value of common stock repurchased |  |  |  |  | $ 80,000 |
Treasury Stock, Shares, Acquired | 2,910,150 | 566,599 |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | $ 500,000 |  |  |  |
Third Accelerated Share Repurchase Agreement [Member] |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |
Shares repurchased, authorized amount |  |  | $ 372,500 |  |  |
Repurchase Agreements [Member] |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |
Shares repurchased, authorized amount |  |  |  | $ 100,000 |  |

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