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Trade and Other Receivables - Summary of Trade and Other Receivables (Detail) - USD ($)
$ in Thousands
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial assets [Line Items]      
Trade receivables $ 112,419 $ 112,403 $ 79,472
Other receivables   9,509 16,918
Gross carrying amount [Member]      
Disclosure of financial assets [Line Items]      
Trade receivables   115,875 82,814
Other receivables   9,537 17,107
Accumulated impairment [Member]      
Disclosure of financial assets [Line Items]      
Trade receivables   (3,472) (3,342)
Other receivables   $ (28) $ (189)