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Financial Instruments by Category - Summary of Carrying Value and Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Financial Assets - Available-for-sale |  |  |
Marketable securities | $ 5,010 | $ 28,327 |
Financial Assets - Loans and receivables |  |  |
Cash and cash equivalents | 479,501 | 883,171 | $ 288,189
Term deposit | 5,508 | 5,292 |
Restricted cash | 310 | 240 |
Accounts receivable and other | 33,627 | 32,159 |
Other assets | 17,517 | 1,810 |
Financial Liabilities at amortized cost |  |  |
Accounts payable and accrued liabilities | 110,651 | 90,705 |
Debt | 593,783 | 591,589 |
Fair value [member] |  |  |
Financial Assets - Available-for-sale |  |  |
Marketable securities | 5,010 | 28,327 |
Financial Assets - Loans and receivables |  |  |
Cash and cash equivalents | 479,501 | 883,171 |
Term deposit | 5,508 | 5,292 |
Restricted cash | 310 | 240 |
Accounts receivable and other | 33,627 | 32,159 |
Other assets | 17,517 | 1,810 |
Financial Liabilities at amortized cost |  |  |
Accounts payable and accrued liabilities | 110,651 | 90,705 |
Debt | $ 595,698 | $ 609,000 |

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