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Related party transactions (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Transactions with Third Party [Line Items] |  |
Contributions from redeemable non-controlling interests | $ 0 | $ 31,105
Equity Method Investee |  |
Transactions with Third Party [Line Items] |  |
Reimbursement of expenses | 11,390 | $ 4,675
Related Party |  |
Transactions with Third Party [Line Items] |  |
Contributions from redeemable non-controlling interests | $ 305,000 |

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- Definition Reimbursement of Expenses Received by Related Parties + References No definition available. + Details
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- Definition Amount of increase in noncontrolling interest from sale of a portion of the parent's controlling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569655-111683 + Details
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