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Senior Secured Notes - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Oct. 05, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Secured Notes [Line Items] |  |  |  |
Senior secured notes, maturity date |  | Oct. 05, 2020 |  |
Cash paid for interest |  | $ 20,116,000 | $ 20,589,000 | $ 20,225,000
Loss on extinguishment of debt |  | 0 | 0 | 14,079,000
Write-off of unamortized issuance costs |  | $ 0 | $ 0 | 1,579,000
Percentage of repurchase of notes on principal amount of notes |  | 101.00% |  |
Percentage of repurchase of notes on principal amount of notes upon sale of assets |  | 100.00% |  |
Senior secured notes, principal amount |  | $ 250,000,000 |  |
7.75% Senior Secured Notes Due October 2020 [Member] |  |  |  |
Secured Notes [Line Items] |  |  |  |
Senior secured notes, interest rate |  | 7.75% |  |
Senior Notes [Member] | 7.75% Senior Secured Notes Due October 2020 [Member] |  |  |  |
Secured Notes [Line Items] |  |  |  |
Senior secured notes, issued | $ 250,000,000 |  |  |
Senior secured notes, interest rate | 7.75% | 7.75% |  |
Senior secured notes, maturity date |  | Oct. 05, 2020 | Oct. 05, 2020 |
Frequency of payment |  | Quarterly |  |
Issuance costs | $ 8,900,000 |  |  |
Debt discount on transaction and facility fees | 8,700,000 |  |  |
Unamortized debt discount and issuance costs |  | $ 4,800,000 |  |
Debt instrument term |  | 5 years |  |
Senior secured notes, cash received | $ 100,300,000 |  |  |
Minimum cash and investments in marketable securities to be maintained |  | $ 60,000,000 |  |
Senior Notes [Member] | 7.75% Senior Secured Notes Due October 2020 [Member] | Level 3 [Member] |  |  |  |
Secured Notes [Line Items] |  |  |  |
Senior secured notes, principal amount |  | $ 250,000,000 |  |
Senior Notes [Member] | 12% Senior Secured Notes Due July 2017 [Member] |  |  |  |
Secured Notes [Line Items] |  |  |  |
Senior secured notes, interest rate | 12.00% |  |  |
Senior secured notes, maturity date | Jul. 15, 2017 |  |  |
Repayment of senior secured notes | $ 125,000,000 |  |  |
Accrued interest paid on 12% notes at redemption | 3,300,000 |  |  |
Redemption premium | 12,500,000 |  |  | 11,300,000
Cash paid for interest | $ 1,200,000 |  |  | 1,200,000
Loss on extinguishment of debt |  |  |  | 14,100,000
Write-off of unamortized issuance costs |  |  |  | $ 1,600,000

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- Definition Amount of cash paid for interest. Includes, but is not limited to, payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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