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Trade and Other Receivables - Summary of Trade and Other Receivables (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Disclosure of financial assets [Line Items]      
Trade receivables $ 79,617 $ 112,419 $ 112,403
Other receivables 12,422   9,509
Gross carrying amount [Member]      
Disclosure of financial assets [Line Items]      
Trade receivables 81,274   115,875
Other receivables 12,502   9,537
Loss allowances [Member]      
Disclosure of financial assets [Line Items]      
Trade receivables (1,657)   (3,472)
Other receivables $ (80)   $ (28)