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Debt - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | May 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 17, 2020 | Sep. 09, 2020 | Jun. 30, 2020 | May 04, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 10, 2012
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Lease, Expense |  |  | $ 7,689,000 | $ 8,829,000 | $ 23,542,000 | $ 24,776,000 |  |  |  |  |  |  |  |
Finance Lease, Right-of-Use Asset, Amortization |  |  | 327,000 | 125,000 | 874,000 | 146,000 |  |  |  |  |  |  |  |
Finance Lease, Interest Expense |  |  | 70,000 | 25,000 | 170,000 | 30,000 |  |  |  |  |  |  |  |
Short-term Lease Payments |  |  | 5,625,000 | 5,530,000 | 18,236,000 | 16,775,000 |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | $ 2,918,993,000 |  | 2,918,993,000 | 2,371,457,000 | 2,918,993,000 | 2,371,457,000 |  |  | $ 2,612,412,000 |  | $ 2,341,244,000 | $ 2,119,439,000 | $ 1,808,562,000 |
Net income |  |  | 256,466,000 | 223,787,000 | 596,244,000 | 622,402,000 |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  | (61,063,000) | (216,582,000) | (365,542,000) |  |  |  |  |  |  |  |
APIC, Share-based Payment Arrangement, Increase for Cost Recognition |  |  |  | 20,770,000 | 35,565,000 | 58,680,000 |  |  |  |  |  |  |  |
APIC, Share-based Payment Arrangement, Recognition and Exercise |  |  | 36,476,000 | 68,524,000 | 162,522,000 | 247,355,000 |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Stock Options Exercised |  |  | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |
Lease, Cost |  |  | 13,711,000 | 14,509,000 | 42,822,000 | 41,727,000 |  |  |  |  |  |  |  |
Operating cash flows from operating leases |  |  | 7,339,000 | 5,757,000 | 20,733,000 | 19,515,000 |  |  |  |  |  |  |  |
Operating cash flows from finance leases |  |  | 70,000 | 46,000 | 170,000 | 30,000 |  |  |  |  |  |  |  |
Financing cash flows from finance leases |  |  | 253,000 | 190,000 | 665,000 | 116,000 |  |  |  |  |  |  |  |
Operating leases |  |  | 1,806,000 | 5,532,000 | 7,491,000 | 11,546,000 |  |  |  |  |  |  |  |
Finance leases |  |  | 9,056,000 | 1,065,000 | 9,496,000 | 6,369,000 |  |  |  |  |  |  |  |
Deferred Compensation Activity Adjustments |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | 206,000 |  | 206,000 | 206,000 | 206,000 | 206,000 |  |  | 206,000 |  | 206,000 | 206,000 | 206,000 |
Additional Paid-In-Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | 2,188,207,000 |  | 2,188,207,000 | 2,020,180,000 | 2,188,207,000 | 2,020,180,000 |  |  | 2,151,623,000 |  | 2,055,407,000 | 1,962,156,000 | 1,820,223,000 |
APIC, Share-based Payment Arrangement, Increase for Cost Recognition |  |  |  | 20,770,000 | 35,565,000 | 58,680,000 |  |  |  |  |  |  |  |
APIC, Share-based Payment Arrangement, Recognition and Exercise |  |  | 36,476,000 | 68,524,000 | 162,522,000 | 247,355,000 |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Stock Options Exercised |  |  | (13,531,000) | (31,270,000) | (65,287,000) | (106,078,000) |  |  |  |  |  |  |  |
Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | 8,506,116,000 |  | 8,506,116,000 | 7,653,735,000 | 8,506,116,000 | 7,653,735,000 |  |  | 8,249,650,000 |  | 7,909,872,000 | 7,429,948,000 | 7,031,333,000 |
Net income |  |  | 256,466,000 | 223,787,000 | 596,244,000 | 622,402,000 |  |  |  |  |  |  |  |
Treasury Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | (7,775,536,000) |  | (7,775,536,000) | (7,302,664,000) | (7,775,536,000) | (7,302,664,000) |  |  | (7,789,067,000) |  | (7,624,241,000) | (7,272,871,000) | (7,043,200,000) |
Treasury Stock, Value, Acquired, Cost Method |  |  |  | (61,063,000) | (216,582,000) | (365,542,000) |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Stock Options Exercised |  |  | 13,531,000 | 31,270,000 | 65,287,000 | 106,078,000 |  |  |  |  |  |  |  |
Deferred Compensation Trust [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | (16,710,000) |  | (16,710,000) | (16,912,000) | (16,710,000) | (16,912,000) |  |  | (16,710,000) |  | (16,912,000) | (16,912,000) | (16,937,000) |
Deferred Compensation Activity Adjustments |  |  |  |  | 202,000 | 25,000 |  |  |  |  |  |  |  |
Deferred Compensation Liability [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | 16,710,000 |  | 16,710,000 | $ 16,912,000 | 16,710,000 | 16,912,000 |  |  | $ 16,710,000 |  | $ 16,912,000 | $ 16,912,000 | $ 16,937,000 |
Deferred Compensation Activity Adjustments |  |  |  |  | (202,000) | $ (25,000) |  |  |  |  |  |  |  |
Senior Notes due 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes principal amount | $ 600,000,000 |  | $ 600,000,000 |  | $ 600,000,000 |  |  |  |  |  |  |  |  |
Senior notes interest rate | 3.95% |  | 3.95% |  | 3.95% |  |  |  |  |  |  |  |  | 3.95%
Frequency of senior notes payment |  |  |  |  | semi-annually in arrears on March 15 and September 15 |  |  |  |  |  |  |  |  |
Senior notes effective interest rate | 3.97% |  | 3.97% |  | 3.97% |  |  |  |  |  |  |  |  |
Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum loan borrowing capacity | $ 200,000,000 |  | $ 200,000,000 |  | $ 200,000,000 |  |  |  |  |  |  |  |  |
Increase in commitment available |  |  |  |  | 300,000,000 |  |  |  |  |  |  |  |  |
Debt outstanding | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Credit Agreement [Member] | Revolving Credit Facility [Member] | Sublimit for Issuance of Letters of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum loan borrowing capacity | 100,000,000 |  | 100,000,000 |  | 100,000,000 |  |  |  |  |  |  |  |  |
Letters of credit outstanding | 11,450,000 |  | 11,450,000 |  | 11,450,000 |  |  |  |  |  |  |  |  |
Credit Agreement [Member] | Revolving Credit Facility [Member] | Sublimit for Swing Line Commitment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum loan borrowing capacity | 25,000,000 |  | 25,000,000 |  | 25,000,000 |  |  |  |  |  |  |  |  |
Repurchase Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum loan borrowing capacity | 150,000,000 |  | 150,000,000 |  | 150,000,000 |  |  |  |  |  |  |  |  |
Debt outstanding | $ 0 |  | $ 0 |  | $ 0 |  |  |  |  |  |  |  |  |
Senior Notes Due Two Thousand Thirty [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes principal amount |  |  |  |  |  |  | $ 50,000,000 | $ 250,000,000 |  | $ 600,000,000 |  |  |  |
Senior notes interest rate | 3.00% |  | 3.00% |  | 3.00% |  |  |  |  | 3.00% |  |  |  |
Frequency of senior notes payment |  |  |  |  | semi-annually in arrears on May 15 and November 15 |  |  |  |  |  |  |  |  |
Senior notes effective interest rate |  |  |  |  |  |  | 2.00% |  |  | 3.02% |  |  |  |
Proceeds from Debt, Net of Issuance Costs | $ 323,900,000 | $ 595,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Debt, Net of Issuance Costs | $ 323,900,000 | $ 595,300,000 |  |  |  |  |  |  |  |  |  |  |  |

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