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Shareholders' Equity - Additional Information (Detail) - USD ($) |  | 12 Months Ended | 48 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 12, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2017 | Dec. 31, 2018 | Mar. 28, 2018 | Mar. 14, 2018 | Jul. 20, 2015 | Jul. 21, 2014
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  | 560,000,000 |  |  |  | 560,000,000 | 560,000,000 |  |  |  |
Common Stock, Par or Stated Value Per Share |  | $ 0.10 |  |  |  | $ 0.10 | $ 0.10 | $ 0.10 |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 100,000,000.0 |  |  |  |
Common Stock, Shares, Outstanding |  | 276,210,910 |  |  |  | 276,210,910 | 279,583,006 |  |  |  |
Treasury stock shares (in shares) |  | 10,718,319 |  |  |  | 10,718,319 | 13,796,696 |  |  |  |
Fair value of common stock repurchased |  | $ 386,322,000 |  |  |  | $ 386,322,000 | $ 477,572,000 |  |  |  |
Accelerated Share Repurchases, Settlement (Payment) or Receipt |  |  |  |  |  |  | 20,000,000.0 |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  |  |  | 147,500,000 |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  | 13,800,000 |  |  |  |  |
Accelerated Share Repurchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |
Treasury stock shares (in shares) |  | 2,883,349 | 209,618 | 5,408,819 | 2,384,760 | 2,883,349 |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share |  | $ 48.51 | $ 36.53 | $ 32.35 | $ 31.46 |  |  |  |  |  |
Fair value of common stock repurchased |  | $ 139,900,000 | $ 7,700,000 | $ 175,000,000.0 | $ 75,000,000.0 | $ 139,900,000 | 80,000,000.0 |  |  |  |
Treasury Stock, Shares, Acquired | 2,910,150 |  |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 100,000,000.0 |  |  | $ 400,000,000.0 | $ 200,000,000.0
2 for 1 Stock Split [Member] |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  | 560,000,000 | 280,000,000 |  |
Common Stock, Shares, Outstanding |  |  |  |  |  |  |  | 276,000,000 | 138,000,000 |  |

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- Definition Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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