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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | Dec. 12, 2018 | May 01, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018
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Accelerated Share Repurchases [Line Items] |  |  |  |  |
Shares repurchased, authorized amount |  |  | $ 147,500 | $ 100,000 |
Shares repurchased, number of shares received initially (in shares) |  |  |  | 13,796,696 | 13,796,696
Fair value of common stock repurchased |  |  | 477,572 | $ 477,572 |
Accelerated Share Repurchases, Settlement (Payment) or Receipt |  |  |  | $ 20,000 |
Common Stock, Shares, Outstanding |  |  |  | 279,583,006 | 282,047,861
Common Stock, Shares Authorized |  |  |  | 560,000,000 | 560,000,000
Common Stock, Par or Stated Value Per Share |  |  |  | $ 0.10 | $ 0.10
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 |  |  |  |
Repurchase Agreements [Member] |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |
Shares repurchased, authorized amount |  |  | $ 100,000 |  |
Subsequent Event [Member] | Third Accelerated Share Repurchase Agreement [Member] |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |
Shares repurchased, authorized amount |  | $ 372,500 |  |  |
Shares repurchased, number of shares received initially (in shares) |  | 500,000,000.0 |  |  |

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