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Shareholders' Equity - Summary of Changes in Shareholders' Equity (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 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 | $ 195,816 | $ 162,102 | 565,039 | $ 412,902 |
Purchase of common stock for treasury |  |  | (657,369) |  |
Equity-based compensation |  |  | 51,690 |  |
Proceeds from Options exercised |  |  | 115,268 |  |
Ending Balance | 1,682,316 |  | 1,682,316 |  |
Common Stock [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance |  |  | 206 |  |
Ending Balance | 206 |  | 206 |  |
Additional Paid-In-Capital [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance |  |  | 1,644,197 |  |
Equity-based compensation |  |  | 51,690 |  |
Proceeds from Options exercised |  |  | 115,268 |  |
Treasury stock issued upon option exercise and restricted share vesting |  |  | (48,832) |  |
Ending Balance | 1,762,323 |  | 1,762,323 |  |
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 |  |  | 565,039 |  |
Ending Balance | 6,799,175 |  | 6,799,175 |  |
Treasury Stock [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance |  |  | (6,270,851) |  |
Purchase of common stock for treasury |  |  | (657,369) |  |
Treasury stock issued upon option exercise and restricted share vesting |  |  | 48,832 |  |
Ending Balance | (6,879,388) |  | (6,879,388) |  |
Deferred Compensation Trust [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance |  |  | (17,383) |  |
Deferred compensation activity, net |  |  | 455 |  |
Ending Balance | (16,928) |  | (16,928) |  |
Deferred Compensation Liability [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance |  |  | 17,383 |  |
Deferred compensation activity, net |  |  | (455) |  |
Ending Balance | $ 16,928 |  | $ 16,928 |  |

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