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Borrowings - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Oct. 23, 2017
Debt Instrument [Line Items] |  |  |
Principal amount | $ 101,700 |  |
2021 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | $ 18,690 | $ 23,690 | $ 23,700
Senior notes, effective interest rate | 5.75% |  | 5.75%
Maturity date | Oct. 23, 2021 |  |
Facility Financing Obligation |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | $ 11,495 | 54,407 |
2019 notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | $ 9,000 | 39,400 |
Senior notes, effective interest rate | 9.75% |  |
Tranche B notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | $ 2,500 | $ 15,000 |
Senior notes, effective interest rate | 8.75% |  |

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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 Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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