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Debt - Additional Information (Detail) | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) shares $ / shares | Mar. 31, 2018 USD ($)
Senior Secured Notes Due 2022 | 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% |  |
5.50% convertible senior notes due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount |  |  | $ 1,000 |
5.50% convertible senior notes due 2021 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount | $ 213,500,000 | $ 213,500,000 | $ 213,500,000.0 |
Interest rate | 5.50% |  | 5.50% |
Effective interest rate |  |  | 9.50% |
Debt conversion rate (in shares) | shares |  |  | 102.4249 |
Total number of convertible shares (in shares) | shares |  |  | 21,867,716 |
Conversion price (in usd per share) | $ / shares | $ 12.75 |  | $ 9.76 |
Payments for capped call transactions |  |  | $ 27,300,000 |
Conversion premium percentage | 60.00% |  | 22.50% |
Credit Agreement | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity | $ 145,000,000 |  |  | $ 125,000,000.0
Accordion feature increase limit | 150,000,000 |  |  |
Borrowings outstanding | 0 |  |  |
Available borrowings | $ 128,100,000 |  |  |
Springing maturity date, period prior to maturity date of convertible debt | 91 days |  |  |
Springing maturity date, period prior to maturity date of secured debt | 60 days |  |  |
Credit Agreement | Letter of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity | $ 30,000,000 |  |  |
Letters of credit outstanding | $ 6,900,000 |  |  |
Credit Agreement | Line of Credit | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Requirement to maintain minimum fixed charge coverage ratio, availability threshold, percent of lenders' commitments under facility | 10.00% |  |  |
Requirement to maintain minimum fixed charge coverage ratio, availability threshold | $ 15,000,000 |  |  |
Amount of aggregate default under other debt that would trigger event of default | $ 50,000,000 |  |  |

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- Definition Line of Credit Facility, Accordion Feature, Increase Limit + References No definition available. + Details
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- Definition Line of Credit Facility, Springing Maturity Date, Period Prior to Maturity Date of Convertible Debt + References No definition available. + Details
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- Definition Line of Credit Facility, Springing Maturity Date, Period Prior to Maturity Date of Secured Debt + References No definition available. + Details
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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 Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt 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(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://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 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=6879938&loc=d3e572229-122910 + Details
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