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v3.21.1

Debt - Additional Information (Detail) |  |  |  |  |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 16, 2030 USD ($) | Mar. 20, 2024 Day | Mar. 05, 2021 USD ($) | Feb. 19, 2020 | Mar. 26, 2019 | Jun. 30, 2021 Day | Mar. 31, 2021 USD ($) $ / shares | Mar. 31, 2021 USD ($) Day $ / shares | Dec. 31, 2020 USD ($) | Apr. 30, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of our indebtedness |  |  |  |  |  |  | $ 1,203,500,000 | $ 1,203,500,000 | $ 657,600,000 |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Trading price per principal amount of notes |  |  |  |  |  |  |  | 1,000 |  |
Debt instrument fair value of trading price |  |  |  |  |  |  |  | $ 1,000 |  |
Capped Calls [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, initial strike price | $ / shares |  |  |  |  |  |  | 132.20 | 132.20 |  |
Derivative, initial cap price | $ / shares |  |  |  |  |  |  | 179.26 | 179.26 |  |
Derivative, premium paid |  |  |  |  |  |  | $ 45,000,000.0 |  |  |
Reduction to additional paid-in capital |  |  |  |  |  |  | (33,000,000.0) |  |  |
Net of deferred tax impact |  |  |  |  |  |  | 12,000,000.0 | $ 12,000,000.0 |  |
Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument principal amount | $ 575,000,000.0 |  | $ 500,000,000.0 |  |  |  | 575,000,000.0 | $ 575,000,000.0 |  |
Term loan debt maturity period |  |  |  |  |  |  |  | Mar. 15, 2026 |  |
Debt instrument percentage of aggregate principal amount | 0.25% |  | 0.25% |  |  |  |  | 0.25% |  |
Debt instrument additional aggregate principal amount | $ 75,000,000.0 |  |  |  |  |  | $ 75,000,000.0 | $ 75,000,000.0 |  |
Debt instrument bear interest rate |  |  |  |  |  |  | 0.25% | 0.25% |  |
Net proceeds from deducting initial purchase discounts and other debt issuance costs |  |  | $ 561,800,000 |  |  |  |  | $ 561,800,000 |  |
Debt instrument frequency of periodic payment |  |  |  |  |  |  |  | semiannually |  |
Debt instrument payment terms |  |  |  |  |  |  |  | The Notes bear interest at a rate of 0.25% per year and interest is payable semiannually in arrears on March 15 and September 15 of each year, beginning on September 15, 2021. |  |
Debt instrument payment beginning date |  |  |  |  |  |  |  | Sep. 15, 2021 |  |
Debt instrument common stock exceeds conversion price percentage |  |  |  |  |  |  |  | 98.00% |  |
Number of conversion price, consecutive trading days | Day |  |  |  |  |  |  |  | 10 |  |
Number of conversion price, consecutive business days | Day |  |  |  |  |  |  |  | 5 |  |
Trading price per principal amount of notes |  |  |  |  |  |  |  | $ 1,000 |  |
Debt instrument, interest rate during period |  |  |  |  |  |  |  | 4.50% |  |
Debt instrument, convertible, carrying amount of equity component |  |  |  |  |  |  | $ 108,600,000 | $ 108,600,000 |  |
Total issuance costs |  |  |  |  |  |  | 14,400,000 | $ 14,400,000 |  |
Senior note, amortized interest rate |  |  |  |  |  |  |  | 5.10% |  |
Debt instrument fair value of trading price |  |  |  |  |  |  |  | $ 1,000 |  |
Convertible Senior Notes [Member] | Liability Component [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total issuance costs |  |  |  |  |  |  | 11,700,000 | 11,700,000 |  |
Net carrying amount |  |  |  |  |  |  | 455,600,000 | 455,600,000 |  |
Convertible Senior Notes [Member] | Equity Component |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total issuance costs |  |  |  |  |  |  | 2,700,000 | 2,700,000 |  |
Net carrying amount |  |  |  |  |  |  | 77,700,000 | 77,700,000 |  |
Deferred tax impact |  |  |  |  |  |  | 28,200,000 | 28,200,000 |  |
Convertible Senior Notes [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of conversion price trading days | Day |  | 20 |  |  |  | 20 |  |  |  |
Number of conversion price, consecutive trading days | Day |  | 30 |  |  |  | 30 |  |  |  |
Convertible Senior Notes [Member] | Maximum [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument common stock exceeds conversion price percentage |  | 130.00% |  |  |  | 130.00% |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Available capacity for letters of credit |  |  |  |  |  |  | 300,000,000.0 | $ 300,000,000.0 | 300,000,000.0 | $ 300,000,000.0
Line of credit maturity date |  |  |  |  |  |  |  | Apr. 30, 2023 |  |
Senior Secured Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate description |  |  |  |  |  |  |  | Term Debt interest rate was reduced from LIBOR plus 3.00% to LIBOR plus 2.50%. |  |
Accrued interest |  |  |  |  |  |  | $ 300,000 | $ 300,000 | $ 100,000 |
Senior Secured Credit Facility [Member] | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable interest rate |  |  |  | 2.50% | 3.00% |  |  |  |  |
Term Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument principal amount |  |  |  |  |  |  |  |  |  | $ 680,000,000.0
Term loan debt maturity period |  |  |  |  |  |  |  | Apr. 30, 2025 |  |
Debt instrument bear interest rate |  |  |  |  |  |  | 2.60% | 2.60% | 2.60% |

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