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Debt - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 20, 2018 USD ($) $ / shares | Nov. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Nov. 15, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 101.38 |  |  |
Loss on early extinguishment of debt |  |  | $ (9,072,000) | $ 0 | $ 0 | $ 0 | $ 0 | $ (9,072,000) | $ 0 |
Unamortized debt issue costs |  |  | 6,681,000 |  |  |  | 5,248,000 | 6,681,000 |  |
Senior Notes | Convertible Note Due 2023 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount | $ 316,300,000 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 2.00% |  |  |  |  |  |  |  |  |
Conversion rate | 9.8643 |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares | $ 101.38 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  | 6,000,000.0 |  |
Write off of deferred debt issuance cost |  |  |  |  |  |  |  | 3,100,000 |  |
Line of Credit |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowing limit used |  |  |  |  |  |  | 1,000,000.0 |  |  |
Line of Credit | Credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior secured revolving line of credit |  |  |  |  |  |  | $ 550,000,000.0 |  |  |
Line of credit, maturity date |  |  |  |  |  |  | Jun. 26, 2020 |  |  |
Debt issuance costs |  | $ 1,700,000 |  |  |  |  |  |  |  |
Borrowings outstanding |  |  |  |  |  |  | $ 0 |  |  |
Unamortized debt issue costs |  |  | $ 3,600,000 |  |  |  | $ 2,000,000.0 | $ 3,600,000 |  |
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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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031898-161870 + Details
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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section S45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68176171&loc=SL68176184-208336 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The excess of the (1) fair value of consideration transferred to the holders of a security in excess of (2) the carrying amount of the security reported on the registrant's balance sheet, which will be deducted from net earnings to derive net earnings available to common shareholders. This amount is generally an adjustment considered in the computation of earnings per share. + References No definition available. + Details
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