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Indebtedness - Senior Notes - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 | Jun. 30, 2018 | Dec. 31, 2017 | Oct. 05, 2017
Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum redemption price of notes as percentage of principal amount |  | 101.00% |  |
5.875% Senior Notes Due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on notes |  | 5.875% | 5.875% | 5.875%
5.875% Senior Notes Due 2022 | Senior Notes Exchange Offer | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes exchange amount | $ 329,200 |  |  |
Interest rate on notes | 5.875% |  |  |
5.00% Senior Notes Due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes exchange amount | $ 741,531 |  |  |
Interest rate on notes | 5.00% | 5.00% | 5.00% | 5.00%
5.00% Senior Notes Due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes exchange amount | $ 580,032 |  |  |
Interest rate on notes | 5.00% | 5.00% | 5.00% | 5.00%
5.75% Senior Notes Due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes exchange amount | $ 475,952 |  |  |
Interest rate on notes | 5.75% | 5.75% | 5.75% | 5.75%

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