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Note Stockholders' equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Dividends, Common Stock, Cash |  |  | $ 76,200 | $ 76,620 |  |
Dividends Payable | $ 25,100 |  | 25,100 |  |  |
Stockholders Equity | $ 5,244,349 | $ 5,285,431 | $ 5,244,349 | 5,285,431 | $ 5,103,905 | $ 5,197,957
Dividend payable, to be paid date |  |  | Oct. 01, 2018 |  |  |
Dividends payable, record date |  |  | Aug. 23, 2018 |  |  |
Initial shares received as part of an accelerated share repurchase program | 2,000,000 |  |  |  |  |
Common stock purchases |  |  | $ 127,443 | $ 77,418 |  |
Dividends Declared per Common Share | $ 0.25 | $ 0.25 | $ 0.75 | $ 0.75 |  |
Accelerated share repurchases settlement receipt | $ 125,000 |  | $ 125,000 |  |  |
Treasury Stock |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Stockholders Equity | (183,872) | $ (90,222) | (183,872) | $ (90,222) | (90,142) | (8,286)
Common stock purchases |  |  | 104,423 | 81,936 |  |
Surplus |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Stockholders Equity | 4,281,515 | $ 4,265,053 | 4,281,515 | 4,265,053 | $ 4,298,503 | $ 4,255,022
Common stock purchases |  |  | $ 23,020 | $ (4,518) |  |
Accelerate Share Repurchase Transaction | Treasury Stock |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Common stock purchases | 102,000 |  |  |  |  |
Accelerate Share Repurchase Transaction | Surplus |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Common stock purchases | $ 23,000 |  |  |  |  |

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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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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + 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(30)) -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 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: 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(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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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