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Stock-Based Compensation - Disclosures for 2004 Purchase Plan (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Payment Arrangement [Abstract] |  |  |
Weighted-average purchase price per share (in dollars per share) | $ 371.71 | $ 354.72 | $ 341.48
Weighted-average grant date fair value per share (in dollars per share) | $ 114.08 | $ 104.84 | $ 90.04
Number of shares purchased (in shares) | 167,113 | 146,640 | 145,346

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