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Recent Accounting Pronouncements and Changes to Accounting Policies - Summary of Measurement Category of Financial Assets (Detail) - Increase (decrease) due to application of IFRS 9 [member]
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cash and cash deposits and cash in escrow [member] | Financial assets at amortised cost, category [member]    
Disclosure of financial assets at date of initial application of IFRS 9 [line items]    
Financial assets measurement, after Amortized cost  
Cash and cash deposits and cash in escrow [member] | Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently, category [member]    
Disclosure of financial assets at date of initial application of IFRS 9 [line items]    
Financial assets measurement, before   FVPL
Receivables and other current financial assets [member] | Financial assets at amortised cost, category [member]    
Disclosure of financial assets at date of initial application of IFRS 9 [line items]    
Financial assets measurement, after Amortized cost  
Financial assets measurement, before   Amortized cost
Equity securities [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member]    
Disclosure of financial assets at date of initial application of IFRS 9 [line items]    
Financial assets measurement, after Mandatorily at FVPL  
Equity securities [member] | Investments in equity instruments designated at fair value through other comprehensive income [member]    
Disclosure of financial assets at date of initial application of IFRS 9 [line items]    
Financial assets measurement, before   FVOCI
Bonds [member] | Financial assets measured at fair value through other comprehensive income, category [member]    
Disclosure of financial assets at date of initial application of IFRS 9 [line items]    
Financial assets measurement, after FVOCI  
Financial assets measurement, before   FVOCI
Holdbacks on long-term contracts [member] | Financial assets at amortised cost, category [member]    
Disclosure of financial assets at date of initial application of IFRS 9 [line items]    
Financial assets measurement, after Amortized cost  
Financial assets measurement, before   Amortized cost
Indemnifications [member] | Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently, category [member]    
Disclosure of financial assets at date of initial application of IFRS 9 [line items]    
Financial assets measurement, after FVPL  
Financial assets measurement, before   FVPL
Other financial asset [member] | Financial assets at amortised cost, category [member]    
Disclosure of financial assets at date of initial application of IFRS 9 [line items]    
Financial assets measurement, after Amortized cost  
Financial assets measurement, before   Amortized cost