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Debt - Encore Convertible Notes (Detail) |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 27, 2017 USD ($) shares | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) $ / shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Mar. 31, 2014 USD ($) | Jul. 31, 2013 USD ($) | Dec. 31, 2012 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Convertible notes settled by cash payment |  |  | $ 125,407,000 | $ 0 | $ 0 |  |  |
Convertible senior notes sold |  |  | 483,500,000 | 448,500,000 |  |  |  |
Proceeds from issuance of convertible senior notes |  |  | 150,000,000 | 0 | $ 0 |  |  |
Equity component |  |  | 62,696,000 | 61,314,000 |  |  |  |
Liability component—principal amount |  |  | 483,500,000 | 448,500,000 |  |  |  |
Unamortized debt discount |  |  | (32,720,000) | (31,968,000) |  |  |  |
Liability component—net carrying amount |  |  | 450,780,000 | 416,532,000 |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest expense—stated coupon rate |  |  | 15,721,000 | 13,263,000 |  |  |  |
Interest expense—amortization of debt discount |  |  | 9,871,000 | 9,900,000 |  |  |  |
Total interest expense |  |  | $ 25,592,000 | $ 23,163,000 |  |  |  |
2017 Convertible Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares |  |  | $ 31.56 |  |  |  |  |
2017 Convertible Senior Notes | Convertible Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Convertible notes settled by cash payment | $ 65,000,000 | $ 60,400,000 |  |  |  |  |  |
Convertible senior notes sold |  | 50,000,000.0 |  |  |  |  |  | $ 115,000,000.0
Stated interest rate |  |  |  |  |  |  |  | 3.00%
Settlement of convertible notes (shares) | shares | 621,599 |  |  |  |  |  |  |
Exercise of convertible note hedge transactions, net of tax (shares) | shares | 621,612 |  |  |  |  |  |  |
2020 Convertible Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  | 3.00% |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares |  |  | $ 45.72 |  |  |  |  |
Closing stock price at date of issuance (in dollars per share) | $ / shares |  |  | $ 33.35 |  |  |  |  |
Conversion rate (in shares per $1,000 principal amount) |  |  | 0.0218718 |  |  |  |  |
Debt component |  |  | $ 140,247,000 |  |  |  |  |
Equity component |  |  | 32,253,000 |  |  |  |  |
Issuance of convertible note |  |  | $ 1,106,000 |  |  |  |  |
Effective interest rate |  |  | 6.35% |  |  |  |  |
2020 Convertible Senior Notes | Convertible Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Convertible senior notes sold |  |  |  |  |  |  | $ 172,500,000 |
Stated interest rate |  |  |  |  |  |  | 3.00% |
2021 Convertible Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  | 2.875% |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares |  |  | $ 59.39 |  |  |  |  |
Closing stock price at date of issuance (in dollars per share) | $ / shares |  |  | $ 47.51 |  |  |  |  |
Conversion rate (in shares per $1,000 principal amount) |  |  | 0.0168386 |  |  |  |  |
Debt component |  |  | $ 143,645,000 |  |  |  |  |
Equity component |  |  | 17,355,000 |  |  |  |  |
Issuance of convertible note |  |  | $ 581,000 |  |  |  |  |
Effective interest rate |  |  | 4.70% |  |  |  |  |
2021 Convertible Senior Notes | Convertible Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Convertible senior notes sold |  |  |  |  |  | $ 161,000,000.0 |  |
Stated interest rate |  |  |  |  |  | 2.875% |  |
2022 Convertible Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  | 3.25% |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares |  |  | $ 45.57 |  |  |  |  |
Closing stock price at date of issuance (in dollars per share) | $ / shares |  |  | $ 35.05 |  |  |  |  |
Conversion rate (in shares per $1,000 principal amount) |  |  | 0.0219467 |  |  |  |  |
Debt component |  |  | $ 137,266,000 |  |  |  |  |
Equity component |  |  | 12,734,000 |  |  |  |  |
Issuance of convertible note |  |  | $ 398,000 |  |  |  |  |
Effective interest rate |  |  | 5.20% |  |  |  |  |
2022 Convertible Senior Notes | Convertible Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Convertible senior notes sold |  | $ 150,000,000.0 |  |  |  |  |  |
Stated interest rate |  | 3.25% |  |  |  |  |  |
Proceeds from issuance of convertible senior notes |  | $ 145,300,000 |  |  |  |  |  |

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