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Debt - Additional Information (Detail) |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 17, 2017 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | May 08, 2017 | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Charge recognized as a result of redemption |  |  |  | $ 1,500,000 | $ 0 |  |
Senior Secured Notes Due 2022 | Convertible Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount | $ 440,000,000 |  |  |  |  |  |
Interest rate | 10.75% |  |  |  |  |  |
Redemption price, percent of principal amount of notes redeemed | 100.00% |  |  |  |  |  |
Percent of notes with option to redeem | 35.00% |  |  |  |  |  |
Redemption price, percentage of principal amount | 110.75% |  |  |  |  |  |
Redemption price if required collateral coverage ratio not met, percentage of principal amount | 100.00% |  |  |  |  |  |
Minimum collateral coverage ratio | 1.5 |  |  |  |  |  |
Collateral coverage ratio, amount added to cash and cash equivalents | 4.75 |  |  |  |  |  |
Collateral coverage ratio, multiplier for Average Grantor EBITDA for seven most recent fiscal quarters | 4 |  |  |  |  |  |
Period to redeem notes without default if required collateral coverage ratio not met | 90 days |  |  |  |  |  |
Redemption price if company experiences change of control, percent of principal amount | 101.00% |  |  |  |  |  |
Senior Notes Due 2017 | Convertible Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  | 6.25% |  | 6.25% |  | 6.25% |
Charge recognized as a result of redemption |  | $ 1,500,000 |  |  |  |  |
Premium and expenses paid for redemption of debt |  | 1,300,000 |  |  |  |  |
Write off of unamortized discount and fees related to the portion of the notes redeemed |  | 200,000 |  |  |  |  |
Convertible Senior Notes Due 2021 | Convertible Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount |  | $ 213,500,000 |  | $ 213,500,000 |  |  | $ 213,500,000
Interest rate |  | 5.50% |  | 5.50% |  |  |
Interest expense, debt |  | $ 4,700,000 | $ 4,500,000 | $ 9,400,000 | 5,200,000 |  |
Contractual interest coupon |  | 2,900,000 | 2,900,000 | 5,900,000 | 3,400,000 |  |
Amortization of debt discount |  | 1,500,000 | 1,300,000 | 2,900,000 | 1,500,000 |  |
Amortization of debt issuance costs |  | $ 300,000 | $ 300,000 | $ 600,000 | $ 300,000 |  |

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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- Definition Reflects the difference between the fair value of payments made to legally extinguish a debt and its carrying value at that time. This item excludes the write-off of amounts previously capitalized as debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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