XML 148 R134.htm IDEA: XBRL DOCUMENT v3.8.0.1
Employee Benefit - Maturity Profile of Defined Benefit Obligation (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
yr
Dec. 31, 2016
USD ($)
yr
Disclosure of defined benefit plans [Line Items]    
Expected payments $ 21,068 $ 18,062
Weight average duration of defined benefit obligation | yr 11  
Bottom of range [Member]    
Disclosure of defined benefit plans [Line Items]    
Weight average duration of defined benefit obligation | yr   11
Top of range [Member]    
Disclosure of defined benefit plans [Line Items]    
Weight average duration of defined benefit obligation | yr   12
Within one year [Member]    
Disclosure of defined benefit plans [Line Items]    
Expected payments $ 877 $ 594
Between 2 and 5 years [Member]    
Disclosure of defined benefit plans [Line Items]    
Expected payments 1,616 1,496
Between 5 and 10 years [Member]    
Disclosure of defined benefit plans [Line Items]    
Expected payments 3,183 2,431
Beyond 10 years [Member]    
Disclosure of defined benefit plans [Line Items]    
Expected payments $ 15,392 $ 13,541