Long-Term Debt Obligations - Term Loan Due in 2019 - Additional Information (Detail)	Apr. 16, 2019
Term Loan due in 2019 [Member] \| Subsequent Event [Member] \| Non-recourse debt [Member]
Debt Instrument [Line Items]
Debt instrument, extended maturity term	2019-06

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.

No definition available.

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration