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Fair Value Measurements - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value measurements assets, significant transfers from level 1 to level 2	$ 0	$ 0		$ 0
Fair value measurements assets, significant transfers from level 2 to level 1	0	0		0
Fair value measurements liabilities, significant transfers from level 1 to level 2	0	0		0
Fair value measurements liabilities, significant transfers from level 2 to level 1	0	0		$ 0
Gain associated with remeasuring of investment in a previously unconsolidated subsidiary to fair value as of date	$ 92,624,000	$ 92,624,000
Percentage of remeasuring investment in previously unconsolidated subsidiary	50.00%	50.00%
Remaining controlling interest acquired percentage	50.00%	50.00%
Fair value of investment in unconsolidated subsidiary at acquisition date		$ 110,100,000
Senior notes			$ 791,700,000
4.875% Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value of senior loans	$ 612,900,000	$ 612,900,000	$ 645,700,000
Interest rate of long-term debt	4.875%	4.875%	4.875%
Senior notes	$ 592,600,000	$ 592,600,000	$ 592,000,000
5.25% Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value of senior loans	$ 443,100,000	$ 443,100,000	$ 468,000,000
Interest rate of long-term debt	5.25%	5.25%	5.25%
Senior notes	$ 422,600,000	$ 422,600,000	$ 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%	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	$ 747,700,000	$ 747,700,000	199,900,000
Senior term loans	744,100,000	744,100,000	$ 193,500,000
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	$ 92,600,000	$ 92,600,000

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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.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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