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Shareholders' Equity - Additional Information (Detail) - USD ($) | 12 Months Ended | 48 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2017 | Feb. 09, 2018 | Jul. 20, 2015 | Jul. 21, 2014
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Treasury stock shares (in shares) | 8,003,197 |  |  | 10,718,319 |  |  |
Fair value of common stock repurchased | $ 257,683,000 |  |  | $ 386,322,000 |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  | $ 238,700,000 |  |  |
Treasury Stock, Shares, Acquired |  |  |  | 10,700,000 |  |  |
Accelerated Share Repurchase Agreement [Member] |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Treasury stock shares (in shares) | 209,618 | 5,408,819 | 2,384,760 | 348,460 |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 36.53 | $ 32.35 | $ 31.46 |  |  |  |
Fair value of common stock repurchased | $ 7,700,000 | $ 175,000,000.0 | $ 75,000,000.0 | $ 14,900,000 |  |  |
Second Accelerated Share Repurchase Agreement [Member] |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Treasury stock shares (in shares) |  |  |  | 1,076,176 |  |  |
Fair value of common stock repurchased |  |  |  | $ 50,000,000.0 |  |  |
Third Accelerated Share Repurchase Agreement [Member] |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | 75,000,000.0 |  |  |
Fair value of common stock repurchased |  |  |  | 63,800,000 |  |  |
Maximum [Member] |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 100,000,000.0 |  | $ 400,000,000.0 | $ 200,000,000.0
Subsequent Event [Member] | Third Accelerated Share Repurchase Program [Member] |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Treasury stock shares (in shares) |  |  |  |  | 1,458,713 |  |
Fair value of common stock repurchased |  |  |  |  | $ 11,200,000 |  |
Share Repurchase Executed Part 2 [Member] | Second Accelerated Share Repurchase Agreement [Member] |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Treasury stock shares (in shares) |  |  |  | 108,288 |  |  |
Fair value of common stock repurchased |  |  |  | $ 7,500,000 |  |  |
Share Repurchase Executed Part 2 [Member] | Subsequent Event [Member] | Third Accelerated Share Repurchase Program [Member] |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Treasury stock shares (in shares) |  |  |  |  | 168,227 |  |
Share Repurchase Executed Part 1 [Member] | Second Accelerated Share Repurchase Agreement [Member] |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Treasury stock shares (in shares) |  |  |  | 967,888 |  |  |
Fair value of common stock repurchased |  |  |  | $ 42,500,000 |  |  |
Share Repurchase Executed Part 1 [Member] | Third Accelerated Share Repurchase Agreement [Member] |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Treasury stock shares (in shares) |  |  |  | 1,290,486 |  |  |

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