Income Tax Expense (Recovery) - Components of Provision for Income Tax (Expense) Recovery (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Current	$ (3,219)	$ (8,410)	$ (8,072)	$ (11,221)
Deferred	(185)	(336)	(368)	(1,642)
Income tax expense	$ (3,404)	$ (8,746)	$ (8,440)	$ (12,863)

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Name:	us-gaap_DeferredIncomeTaxExpenseBenefit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration