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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 |

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