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Interim Consolidated Financial Statements - Summary of Lease Balances (Detail)
$ in Thousands
Mar. 31, 2019
USD ($)
Leases [Abstract]  
Operating lease right-of-use assets $ 71,529
Short term operating lease liability $ 16,404
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccruedLiabilitiesCurrent
Non-current operating lease liabilities $ 63,843
Total operating lease liabilities $ 80,247