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Shareholders' Equity - Summary of Changes in Shareholders' Equity (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | $ 1,605,492 |  |
Cumulative-effect adjustment from adoption of ASU 2014-09, net of tax |  |  | $ 2,196
Net income | 166,049 | $ 102,923 |
Purchase of common stock for treasury | (357,242) |  |
Equity-based compensation | 9,509 |  |
Proceeds from stock options exercised | 40,804 |  |
Ending Balance | 1,466,808 |  |
Common Stock [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | 206 |  |
Ending Balance | 206 |  |
Additional Paid-In-Capital [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | 1,644,197 |  |
Equity-based compensation | 9,509 |  |
Proceeds from stock options exercised | 40,804 |  |
Treasury stock issued upon option exercise and restricted share vesting | (16,410) |  |
Ending Balance | 1,678,100 |  |
Retained Earnings [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | 6,231,940 |  |
Cumulative-effect adjustment from adoption of ASU 2014-09, net of tax |  |  | $ 2,196
Net income | 166,049 |  |
Ending Balance | 6,400,185 |  |
Treasury Stock [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | (6,270,851) |  |
Purchase of common stock for treasury | 357,242 |  |
Treasury stock issued upon option exercise and restricted share vesting | 16,410 |  |
Ending Balance | (6,611,683) |  |
Deferred Compensation Trust [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | (17,383) |  |
Deferred compensation activity | (6) |  |
Ending Balance | (17,389) |  |
Deferred Compensation Liability [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | 17,383 |  |
Deferred compensation activity | 6 |  |
Ending Balance | $ 17,389 |  |

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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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