Cash, Cash Equivalents, Short-Term and Long-Term Investments - Additional Information (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Cash Cash Equivalents Short Term And Long Term Investments [Line Items] | |||
| Interest income | $ 3.3 | $ 5.9 | $ 11.8 |
| Maximum [Member] | |||
| Cash Cash Equivalents Short Term And Long Term Investments [Line Items] | |||
| Long-term investments maturity period | 2 years | ||
| X | ||||||||||
- Definition Cash, cash equivalents, short-term and long-term investments. No definition available.
|
| X | ||||||||||
- Definition Long-term investments maturity period. No definition available.
|
| X | ||||||||||
- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|