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Debt - Additional Information (Detail) - USD ($) shares in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
May 07, 2018 | Apr. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |
Capitalized interest costs |  |  | $ 300,000 | $ 200,000 | $ 800,000 | $ 900,000 |
Less unamortized debt issuance costs |  |  | 17,989,000 |  | $ 17,989,000 |  | $ 20,477,000
Shares issued, shares |  |  |  |  | 14,375 |  |
Shares issued |  |  |  |  | $ 217,312,000 |  |
Cash paid for debt prepayment |  | $ 31,600,000 |  |  |  |  |
Cash paid for debt issuance or prepayment costs |  |  |  |  | (20,703,000) | (38,130,000) |
Gain (loss) on extinguishment of debt |  |  | (6,624,000) | $ 0 | (19,562,000) | $ (39,639,000) |
Senior Secured Revolving Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal available |  |  | 100,000,000 |  | 100,000,000 |  |
Senior debt |  |  | 69,401,000 |  | 69,401,000 |  | $ 0
Senior Secured Revolving Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowings |  |  | 143,000,000 |  | $ 143,000,000 |  |
Debt maturity date |  |  |  |  | Oct. 19, 2020 |  |
Applicable margin |  |  |  |  | 3.50% |  |
Second Lien Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Cash paid for debt issuance or prepayment costs | $ (16,700,000) |  |  |  |  |  |
Gain (loss) on extinguishment of debt | $ 12,900,000 |  |  |  |  |  |
Second Lien Credit Agreement | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowings |  |  | 200,000,000 |  | $ 200,000,000 |  |
Less unamortized debt issuance costs |  |  | $ 2,600,000 |  | $ 2,600,000 |  |
Debt maturity date |  |  |  |  | Apr. 19, 2023 |  |
Applicable margin |  |  |  |  | 8.00% |  |
Prepayment penalty percentage |  |  |  |  | 2.00% |  |
Cash paid for debt prepayment |  |  |  |  | $ 4,000,000 |  |
Second Lien Credit Agreement | London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  |  | 1.00% |  | 1.00% |  |
Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Less unamortized debt issuance costs |  |  | $ 3,800,000 |  | $ 3,800,000 |  |

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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=98514028&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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