Variable interest entities - Additional Information (Detail) $ in Thousands	Mar. 31, 2018 USD ($)
Variable Interest Entity [Line Items]
Total assets of variable interest entities	$ 852,912
Total liabilities of variable interest entities	507,962
DMG
Variable Interest Entity [Line Items]
Total assets of variable interest entities	580,039
Total liabilities of variable interest entities	$ 345,926

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5710-111685

+ Details

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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

+ Details

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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.

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- Details

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