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Long-Term Debt - Additional Information (Detail) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 15, 2018 USD ($) | Aug. 20, 2018 USD ($) $ / shares | Nov. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) $ / shares | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  | $ 101.38 |  |  |  | $ 101.38 |  |
Gain on sale of business |  |  |  | $ (9,072,000) | $ 0 | $ 0 | $ 0 | $ (9,072,000) | $ 0 | $ 0
Senior Notes | Convertible Note Due 2023 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 316,300,000.0 |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 2.00% |  |  |  |  |  |  |  |
Conversion rate |  | 9.8643 |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  | $ 101.38 |  |  |  |  |  |  |  |
Debt issuance costs |  | $ 8,400,000 |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  | 2,300,000 |  |
Amortization of debt issuance costs |  |  |  |  |  |  |  | $ 3,000,000 |  |
Effective interest rate |  |  |  | 5.45% |  |  |  | 5.45% |  |
Senior Notes | Convertible Notes 2023 Conversion Feature |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  | $ 7,200,000 |  |  |  |  |  |  |  |
Senior Notes | 6% senior notes due 2022 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount | $ 300,000,000.0 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 6.00% |  |  |  |  |  |  |  |  |
Redemption premium | $ 6,000,000 |  |  |  |  |  |  |  |  |
Write off of deferred debt issuance cost | $ 3,100,000 |  |  |  |  |  |  |  |  |
Line of Credit | Credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior secured revolving line of credit |  |  |  | $ 550,000,000 |  |  |  | $ 550,000,000 |  |
Line of credit, maturity date |  |  |  |  |  |  |  | Jun. 26, 2020 |  |
Debt issuance costs |  |  | $ 1,700,000 |  |  |  |  |  |  |
Borrowings outstanding |  |  |  | 0 |  |  |  | $ 0 |  |
Borrowing limit used |  |  |  | 1,000,000 |  |  |  | 1,000,000 |  |
Unamortized debt issue costs |  |  |  | $ 3,600,000 |  |  |  | $ 3,600,000 | $ 3,100,000 |
Line of Credit | Credit facility | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Commitment fee (as a percent) |  |  |  |  |  |  |  | 0.20% |  |
Fronting fees (as a percent) |  |  |  |  |  |  |  | 1.25% |  |
Line of Credit | Credit facility | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread (as a percent) |  |  | 1.25% |  |  |  |  |  |  |
Line of Credit | Credit facility | Minimum | Base Rate |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread (as a percent) |  |  | 0.25% |  |  |  |  |  |  |
Line of Credit | Credit facility | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Commitment fee (as a percent) |  |  |  |  |  |  |  | 0.35% |  |
Fronting fees (as a percent) |  |  |  |  |  |  |  | 2.00% |  |
Line of Credit | Credit facility | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread (as a percent) |  |  | 2.00% |  |  |  |  |  |  |
Line of Credit | Credit facility | Maximum | Base Rate |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread (as a percent) |  |  | 1.00% |  |  |  |  |  |  |
Debt Instrument, Redemption, Period One | Senior Notes | Convertible Note Due 2023 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  |  |  |  |  |  | 130.00% |  |
Debt Instrument, Redemption, Period Two | Senior Notes | Convertible Note Due 2023 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  |  |  |  |  |  | 98.00% |  |

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