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Indebtedness - Senior Subordinated Notes and Early Extinguishment of Debt - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |
Loss on early extinguishment of debt |  | $ 0 | $ 0 | $ 22,495
Subordinated Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum redemption price of notes as percentage of principal amount |  | 101.00% |  |
Senior Subordinated Notes | 6.75% Senior Subordinated Notes Due 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum redemption price of notes as percentage of principal amount | 103.375% |  |  |
Announced call for redemption amount of debt | $ 500,000 |  |  |
Interest rate on notes | 6.75% |  |  |
Debt instrument, redemption description |  | In July 2015, we announced a call for the redemption of $500.0 million of our outstanding 6.75% senior subordinated notes due 2020 at a price of 103.375% of par plus accrued and unpaid interest, which were redeemed on August 3, 2015. In the year ended 2015, we recognized a loss on early extinguishment of debt of $22.5 million, including transaction call premium costs and the expensing of the remaining deferred financing costs on the repurchased debt |  |

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- Definition Description of debt redemption features under terms of the debt agreement. + 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=75038535&loc=d3e64711-112823 + Details
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