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Capital Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 15, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Oct. 17, 2016 | Mar. 17, 2015
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Common stock, shares authorized |  | 200,000,000 | 200,000,000 |  |  |
Common Stock, par value |  | $ 0.01 | $ 0.01 |  |  |
Preferred stock, shares authorized |  | 10,000,000 |  |  |  |
Preferred stock, par value |  | $ 0.01 |  |  |  |
Stock Repurchase Program, Additional Repurchase Authorization |  |  |  |  | $ 300,000 |
Common stock repurchased, total purchase price |  | $ 277,306 | $ 170,132 | $ 24,666 |  |
Common stock purchased through modified dutch auction tender offer - in shares | 5,308,905 |  |  |  |  | 2,766,354
Common stock purchased through modified dutch auction tender offer - price per share | $ 50.75 |  |  |  |  | $ 58.50
Common stock purchased through modified dutch auction tender offer - total purchase price in dollars | $ 269,400 |  |  |  |  | $ 161,800
Fees And Expenses Incurred Related To Modified Dutch Auction Tender Offer | $ 700 |  |  |  |  | $ 700
Treasury Stock, Value, Acquired, Cost Method |  | 277,306 | $ 170,132 | $ 24,666 |  |
Common stock repurchase, remaining authorized amount |  | $ 129,400 |  |  |  |
Treasury stock, shares |  | 32,505,090 | 27,163,343 |  |  |
Activity related to restricted stock units vested [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Treasury shares issued |  | 181,684 | 146,160 | 531,024 |  |
Average cost for restricted stock units |  | $ 6.30 | $ 6.30 | $ 6.30 |  |
Shares repurchased to satisfy employee withholding tax requirements resulting from certain restricted stock units becoming vested |  | 67,061 | 50,841 | 234,440 |  |
Common stock repurchased, average cost |  | $ 51.15 | $ 56.88 | $ 48.87 |  |
Non-tender offer repurchase [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Repurchases of common stock |  | 147,465 | 139,421 | 508,667 |  |
Common stock repurchased, total purchase price |  | $ 7,200 | $ 7,600 | $ 24,700 |  |
Treasury Stock Acquired, Average Cost Per Share |  | $ 48.81 | $ 54.71 | $ 48.47 |  |
Board of Director Members, Executive Officers, Related Family Foundations |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Repurchases of common stock | 1,679,286 |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 50.75 |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 85,200 |  |  |  |  |

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Number of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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