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Debt - Encore Convertible Notes (Detail) | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2015 USD ($) $ / shares | Dec. 31, 2014 USD ($) | Mar. 31, 2014 USD ($) | Mar. 05, 2014 $ / shares | Jul. 31, 2013 USD ($) | Jun. 24, 2013 $ / shares | Dec. 31, 2012 USD ($) | Nov. 27, 2012 $ / shares
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Convertible senior notes sold | $ 448,500,000 | $ 448,500,000 |  |  |  |  |  |
Equity component | 58,184,000 | 55,236,000 |  |  |  |  |  |
Liability component—principal amount | 448,500,000 | 448,500,000 |  |  |  |  |  |
Unamortized debt discount | (41,867,000) | (51,202,000) |  |  |  |  |  |
Liability component—net carrying amount | 406,633,000 | 397,298,000 |  |  |  |  |  |
Convertible Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest expense—stated coupon rate | 13,245,000 | 12,418,000 |  |  |  |  |  |
Interest expense—amortization of debt discount | 9,335,000 | 8,423,000 |  |  |  |  |  |
Total interest expense | $ 22,580,000 | $ 20,841,000 |  |  |  |  |  |
2017 Convertible Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares | $ 31.56 |  |  |  |  |  |  | $ 31.56
Closing stock price at date of issuance (in dollars per share) | $ / shares | $ 25.66 |  |  |  |  |  |  |
Conversion rate (in shares per $1,000 principal amount) | 31.6832 |  |  |  |  |  |  |
Debt component | $ 100,298,000 |  |  |  |  |  |  |
Equity component | 14,702,000 |  |  |  |  |  |  |
Equity issuance cost | $ 788,000 |  |  |  |  |  |  |
Stated interest rate | 3.00% |  |  |  |  |  |  |
Effective interest rate | 6.00% |  |  |  |  |  |  |
2017 Convertible Senior Notes [Member] | Convertible Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Convertible senior notes sold |  |  |  |  |  |  | $ 115,000,000.0 |
Stated interest rate |  |  |  |  |  |  | 3.00% |
2020 Convertible Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares | $ 45.72 |  |  |  |  | $ 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) | 21.8718 |  |  |  |  |  |  |
Debt component | $ 140,247,000 |  |  |  |  |  |  |
Equity component | 32,253,000 |  |  |  |  |  |  |
Equity issuance cost | $ 1,106,000 |  |  |  |  |  |  |
Stated interest rate | 3.00% |  |  |  |  |  |  |
Effective interest rate | 6.35% |  |  |  |  |  |  |
2020 Convertible Senior Notes [Member] | Convertible Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Convertible senior notes sold |  |  |  |  | $ 172,500,000 |  |  |
Stated interest rate |  |  |  |  | 3.00% |  |  |
2021 Convertible Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares | $ 59.39 |  |  | $ 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) | 16.8386 |  |  |  |  |  |  |
Debt component | $ 143,645,000 |  |  |  |  |  |  |
Equity component | 17,355,000 |  |  |  |  |  |  |
Equity issuance cost | $ 581,000 |  |  |  |  |  |  |
Stated interest rate | 2.875% |  |  |  |  |  |  |
Effective interest rate | 4.70% |  |  |  |  |  |  |
2021 Convertible Senior Notes [Member] | Convertible Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Convertible senior notes sold |  |  | $ 161,000,000.0 |  |  |  |  |
Stated interest rate |  |  | 2.875% |  |  |  |  |

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- Definition Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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