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Shareholders' Equity - Summary of Changes in Shareholders' Equity (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | $ 2,416,919 | $ 1,898,776 | $ 2,341,244 | $ 1,808,562
Net income | 164,075 | 210,209 | 339,778 | 398,615
Deferred Compensation Activity Adjustments | 0 |  | 0 | 0
Treasury Stock, Value, Acquired, Cost Method |  | (87,980) | (216,582) | (304,479)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition |  | 18,577 | 21,926 | 37,910
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition | 14,434 |  |  |
APIC, Share-based Payment Arrangement, Recognition and Exercise | 16,984 | 79,857 | 126,046 | 178,831
Stock Issued During Period, Value, Stock Options Exercised | 0 | 0 | 0 | 0
Ending Balance | 2,612,412 | 2,119,439 | 2,612,412 | 2,119,439
Common Stock [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 206 | 206 | 206 | 206
Ending Balance | 206 | 206 | 206 | 206
Additional Paid-In-Capital [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 2,127,315 | 1,899,100 | 2,055,407 | 1,820,223
APIC, Share-based Payment Arrangement, Increase for Cost Recognition |  | 18,577 | 21,926 | 37,910
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition | 14,434 |  |  |
APIC, Share-based Payment Arrangement, Recognition and Exercise | 16,984 | 79,857 | 126,046 | 178,831
Stock Issued During Period, Value, Stock Options Exercised | (7,110) | (35,378) | (51,756) | (74,808)
Ending Balance | 2,151,623 | 1,962,156 | 2,151,623 | 1,962,156
Retained Earnings [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 8,085,575 | 7,219,739 | 7,909,872 | 7,031,333
Net income | 164,075 | 210,209 | 339,778 | 398,615
Ending Balance | 8,249,650 | 7,429,948 | 8,249,650 | 7,429,948
Treasury Stock [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | (7,796,177) | (7,220,269) | (7,624,241) | (7,043,200)
Treasury Stock, Value, Acquired, Cost Method |  | (87,980) | (216,582) | (304,479)
Stock Issued During Period, Value, Stock Options Exercised | 7,110 | 35,378 | 51,756 | 74,808
Ending Balance | (7,789,067) | (7,272,871) | (7,789,067) | (7,272,871)
Deferred Compensation Trust [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | (16,912) | (16,912) | (16,912) | (16,937)
Deferred Compensation Activity Adjustments | 202 |  | 202 | 25
Ending Balance | (16,710) | (16,912) | (16,710) | (16,912)
Deferred Compensation Liability [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 16,912 | 16,912 | 16,912 | 16,937
Deferred Compensation Activity Adjustments | (202) |  | (202) | (25)
Ending Balance | $ 16,710 | $ 16,912 | $ 16,710 | $ 16,912

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