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Financial instruments by category - Summary of Carrying Value and Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair value through OCI      
Marketable securities $ 2,572 $ 5,010  
Amortized cost      
Cash and cash equivalents 286,312 479,501 $ 883,171
Restricted cash 296 310  
Other assets 10,592 10,285  
Financial Liabilities at amortized cost      
Accounts payable and accrued liabilities 140,878 110,541  
Debt 595,977 593,783  
Fair value [member]      
Fair value through OCI      
Marketable securities 2,572 5,010  
Amortized cost      
Cash and cash equivalents 286,312 479,501  
Term deposit 6,646 5,508  
Restricted cash 13,745 12,927  
Accounts receivable and other 46,196 33,627  
Other assets 3,924 4,900  
Financial Liabilities at amortized cost      
Accounts payable and accrued liabilities 140,878 110,541  
Debt 549,606 595,698  
Carrying amount [member]      
Fair value through OCI      
Marketable securities 2,572 5,010  
Amortized cost      
Cash and cash equivalents 286,312 479,501  
Term deposit 6,646 5,508  
Restricted cash 13,745 12,927  
Accounts receivable and other 46,196 33,627  
Other assets 3,924 4,900  
Financial Liabilities at amortized cost      
Accounts payable and accrued liabilities 140,878 110,541  
Debt $ 595,977 $ 593,783