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Senior Notes and Unsecured Revolving Credit Facility - Schedule of Senior Notes (Phantoms) (Detail) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | May 31, 2016
4.375% Senior notes due 2019 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity date of senior note | Jun. 15, 2019 |  |  |
5.875% Senior notes due 2024 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity date of senior note | Jun. 15, 2024 |  |  |
Senior Notes [Member] | 4.375% Senior notes due 2019 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on senior note (percent) |  | 4.375% | 4.375% |
Maturity date of senior note |  | Jun. 15, 2019 | Jun. 15, 2019 |
Senior Notes [Member] | 4.875% Senior Notes due 2021 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on senior note (percent) |  | 4.875% | 4.875% | 4.875%
Maturity date of senior note |  | Jul. 01, 2021 | Jul. 01, 2021 |
Senior Notes [Member] | 5.875% Senior notes due 2024 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on senior note (percent) |  | 5.875% | 5.875% |
Maturity date of senior note |  | Jun. 15, 2024 | Jun. 15, 2024 |

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