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Related party transactions (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Transactions with Third Party [Line Items]
Non-controlling interest attributable to subsidiary	$ 7,072,000	$ 0	$ 13,914,000	$ 0
Equity Method Investee
Transactions with Third Party [Line Items]
Reimbursement of expenses	7,159,000	942,000	12,853,000	1,936,000
Redeemable Non-Controlling Interest | Affiliated Entity
Transactions with Third Party [Line Items]
Non-controlling interest attributable to subsidiary	7,072,000	0	13,914,000	0
Distributions from interest in non-controlling interest	$ 3,773,000	$ 0	10,867,000	0
Noncontrolling Interest | Affiliated Entity
Transactions with Third Party [Line Items]
Non-controlling interest attributable to subsidiary			0	0
Distributions from interest in non-controlling interest			$ 18,013,000	$ 0

X

- Definition

Net Income (Loss) Attributable to Noncontrolling Interest, Held By Related Party

+ References

No definition available.

+ Details

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- Definition

Reimbursement of Expenses Received by Related Parties

+ References

No definition available.

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- Definition

Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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