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Fair Value Measurements - Schedule of Assets and Liabilities at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets held in rabbi trust | $ 7,992 | $ 9,452 |  |
Marketable securities, available for sale | 189,074 | 211,561 |  |
Deferred compensation liability | 7,244 | 8,241 |  |
Short-term investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 143,864 | 150,752 |  |
Long-term marketable securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 45,210 | 60,809 |  |
U.S. Treasuries [Member] | Short-term investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 114,720 | 124,580 |  |
U.S. Treasuries [Member] | Long-term marketable securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 10,510 | 24,423 |  |
U.S. Government Sponsored Entities [Member] | Short-term investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 9,137 | 0 |  |
U.S. Government Sponsored Entities [Member] | Long-term marketable securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 1,328 | 1,355 |  |
Corporate debt securities [Member] | Short-term investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 19,711 | 26,172 |  |
Corporate debt securities [Member] | Long-term marketable securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 25,606 | 26,471 |  |
Asset-backed securities and other [Member] | Short-term investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 296 |  |  |
Asset-backed securities and other [Member] | Long-term marketable securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 7,766 | 8,560 |  |
Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents | 156,267 | 190,600 |  |
Recurring [Member] | Short-term investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 143,864 | 150,752 |  |
Recurring [Member] | Long-term marketable securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 45,210 | 60,809 |  |
Recurring [Member] | Commercial Paper and Other [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents | 9,498 | 5,087 |  |
Recurring [Member] | Money market funds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents | 146,769 | 185,513 |  |
Recurring [Member] | Assets held in rabbi trust [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets held in rabbi trust | 7,992 | 9,452 |  |
Recurring [Member] | U.S. Treasuries [Member] | Short-term investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 114,720 | 124,580 |  |
Recurring [Member] | U.S. Treasuries [Member] | Long-term marketable securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 10,510 | 24,423 |  |
Recurring [Member] | U.S. Government Sponsored Entities [Member] | Short-term investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 9,137 | 0 |  |
Recurring [Member] | U.S. Government Sponsored Entities [Member] | Long-term marketable securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 1,328 | 1,355 |  |
Recurring [Member] | Corporate debt securities [Member] | Short-term investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 19,711 | 26,172 |  |
Recurring [Member] | Corporate debt securities [Member] | Long-term marketable securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 25,606 | 26,471 |  |
Recurring [Member] | Asset-backed securities and other [Member] | Short-term investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 296 | 0 |  |
Recurring [Member] | Asset-backed securities and other [Member] | Long-term marketable securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 7,766 | 8,560 |  |
Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Deferred compensation liability | 7,244 | 8,241 |  |
Level 1 [Member] | Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents | 146,769 | 185,513 |  |
Level 1 [Member] | Recurring [Member] | Short-term investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 114,720 | 124,580 |  |
Level 1 [Member] | Recurring [Member] | Long-term marketable securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 10,510 | 24,423 |  |
Level 1 [Member] | Recurring [Member] | Commercial Paper and Other [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Level 1 [Member] | Recurring [Member] | Money market funds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents | 146,769 | 185,513 |  |
Level 1 [Member] | Recurring [Member] | Assets held in rabbi trust [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets held in rabbi trust | 0 | 0 |  |
Level 1 [Member] | Recurring [Member] | U.S. Treasuries [Member] | Short-term investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 114,720 | 124,580 |  |
Level 1 [Member] | Recurring [Member] | U.S. Treasuries [Member] | Long-term marketable securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 10,510 | 24,423 |  |
Level 1 [Member] | Recurring [Member] | U.S. Government Sponsored Entities [Member] | Short-term investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 0 | 0 |  |
Level 1 [Member] | Recurring [Member] | U.S. Government Sponsored Entities [Member] | Long-term marketable securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 0 | 0 |  |
Level 1 [Member] | Recurring [Member] | Corporate debt securities [Member] | Short-term investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 0 | 0 |  |
Level 1 [Member] | Recurring [Member] | Corporate debt securities [Member] | Long-term marketable securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 0 | 0 |  |
Level 1 [Member] | Recurring [Member] | Asset-backed securities and other [Member] | Short-term investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 0 | 0 |  |
Level 1 [Member] | Recurring [Member] | Asset-backed securities and other [Member] | Long-term marketable securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 0 | 0 |  |
Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Deferred compensation liability | 0 | 0 |  |
Level 2 [Member] | Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents | 9,498 | 5,087 |  |
Level 2 [Member] | Recurring [Member] | Short-term investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 29,144 | 26,172 |  |
Level 2 [Member] | Recurring [Member] | Long-term marketable securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 34,700 | 36,386 |  |
Level 2 [Member] | Recurring [Member] | Commercial Paper and Other [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents | 9,498 | 5,087 |  |
Level 2 [Member] | Recurring [Member] | Money market funds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Level 2 [Member] | Recurring [Member] | Assets held in rabbi trust [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets held in rabbi trust | 7,992 | 9,452 |  |
Level 2 [Member] | Recurring [Member] | U.S. Treasuries [Member] | Short-term investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 0 | 0 |  |
Level 2 [Member] | Recurring [Member] | U.S. Treasuries [Member] | Long-term marketable securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 0 | 0 |  |
Level 2 [Member] | Recurring [Member] | U.S. Government Sponsored Entities [Member] | Short-term investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 9,137 | 0 |  |
Level 2 [Member] | Recurring [Member] | U.S. Government Sponsored Entities [Member] | Long-term marketable securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 1,328 | 1,355 |  |
Level 2 [Member] | Recurring [Member] | Corporate debt securities [Member] | Short-term investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 19,711 | 26,172 |  |
Level 2 [Member] | Recurring [Member] | Corporate debt securities [Member] | Long-term marketable securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 25,606 | 26,471 |  |
Level 2 [Member] | Recurring [Member] | Asset-backed securities and other [Member] | Short-term investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 296 | 0 |  |
Level 2 [Member] | Recurring [Member] | Asset-backed securities and other [Member] | Long-term marketable securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 7,766 | 8,560 |  |
Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Deferred compensation liability | 0 | 0 |  |
Level 3 [Member] | Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Level 3 [Member] | Recurring [Member] | Short-term investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 0 | 0 |  |
Level 3 [Member] | Recurring [Member] | Long-term marketable securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 0 | 0 |  |
Level 3 [Member] | Recurring [Member] | Commercial Paper and Other [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Level 3 [Member] | Recurring [Member] | Money market funds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Level 3 [Member] | Recurring [Member] | Assets held in rabbi trust [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets held in rabbi trust | 0 | 0 |  |
Level 3 [Member] | Recurring [Member] | U.S. Treasuries [Member] | Short-term investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 0 | 0 |  |
Level 3 [Member] | Recurring [Member] | U.S. Treasuries [Member] | Long-term marketable securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 0 | 0 |  |
Level 3 [Member] | Recurring [Member] | U.S. Government Sponsored Entities [Member] | Short-term investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 0 | 0 |  |
Level 3 [Member] | Recurring [Member] | U.S. Government Sponsored Entities [Member] | Long-term marketable securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 0 | 0 |  |
Level 3 [Member] | Recurring [Member] | Corporate debt securities [Member] | Short-term investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 0 | 0 |  |
Level 3 [Member] | Recurring [Member] | Corporate debt securities [Member] | Long-term marketable securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 0 | 0 |  |
Level 3 [Member] | Recurring [Member] | Asset-backed securities and other [Member] | Short-term investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 0 | 0 |  |
Level 3 [Member] | Recurring [Member] | Asset-backed securities and other [Member] | Long-term marketable securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities, available for sale | 0 | 0 |  |
Contingent Consideration [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration | 3,162 | 3,387 | $ 2,923 | $ 2,875
Contingent Consideration [Member] | Level 1 [Member] | Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration | 0 | 0 |  |
Contingent Consideration [Member] | Level 2 [Member] | Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration | 0 | 0 |  |
Contingent Consideration [Member] | Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration | $ 3,162 | $ 3,387 |  |

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