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Fair Value Measurements - Additional Information (Detail) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 12, 2014 | Sep. 26, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value measurements assets, significant transfers from level 1 to level 2 | $ 0 | $ 0 |  |  |
Fair value measurements assets, significant transfers from level 2 to level 1 | 0 | 0 |  |  |
Fair value measurements liabilities, significant transfers from level 1 to level 2 | 0 | 0 |  |  |
Fair value measurements liabilities, significant transfers from level 2 to level 1 | 0 | 0 |  |  |
Gain associated with remeasuring of investment in a previously unconsolidated subsidiary to fair value as of date | $ 100,420,000 |  |  |  |
Percentage of remeasuring investment in previously unconsolidated subsidiary | 50.00% |  |  |  |
Remaining controlling interest acquired percentage | 50.00% |  |  |  |
Fair value of investment in unconsolidated subsidiary at acquisition date | $ 110,100,000 |  |  |  |
Senior notes |  | 791,700,000 |  |  |
Notes payable on real estate | 6,300,000 | 17,900,000 |  |  |
4.875% Senior Notes [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Estimated fair value of senior loans | $ 616,400,000 | $ 645,700,000 |  |  |
Interest rate of long-term debt | 4.875% | 4.875% |  |  |
Senior notes | $ 592,800,000 | $ 592,000,000 |  |  |
5.25% Senior Notes [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Estimated fair value of senior loans | $ 443,700,000 | $ 468,000,000 |  |  |
Interest rate of long-term debt | 5.25% | 5.25% |  | 5.25% | 5.25%
Senior notes | $ 422,700,000 | $ 422,400,000 |  |  |
5.00% Senior Notes [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Estimated fair value of senior loans |  | $ 823,800,000 |  |  |
Interest rate of long-term debt | 5.00% | 5.00% |  |  |
Senior notes |  | $ 791,700,000 |  |  |
Redemption details | In March 2018, we redeemed our 5.00% senior notes in full |  |  |  |
Senior term loans [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Estimated fair value of senior loans | $ 757,000,000 | 199,900,000 |  |  |
Senior term loans | 751,300,000 | 193,500,000 |  |  |
Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Assets, fair value disclosure, nonrecurring |  | 0 | $ 0 |  |
Liabilities, fair value disclosure, nonrecurring |  | $ 0 | $ 0 |  |
Previously Unconsolidated Subsidiary [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Gain associated with remeasuring of investment in a previously unconsolidated subsidiary to fair value as of date | $ 100,400,000 |  |  |  |

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- Definition Through June 8, 2015, carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets. June 9, 2015 and after, carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. + References No definition available. + Details
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