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Variable interest entities - Additional Information (Detail) $ in Thousands | Sep. 30, 2018 USD ($)
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Variable Interest Entity [Line Items] |
Total assets of variable interest entities | $ 916,672
Total liabilities of variable interest entities | 508,743
DMG held for sale |
Variable Interest Entity [Line Items] |
Total assets of variable interest entities | 658,054
Total liabilities of variable interest entities | $ 355,172

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- Definition The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5710-111685 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5710-111685 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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 No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Details
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