XML 141 R123.htm IDEA: XBRL DOCUMENT v3.8.0.1
Bonds Payable - Major Terms of Overseas Unsecured Bonds (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Issuance period one [member] | Overseas [member]  
Bonds Payable [Line Items]  
Overseas unsecured bonds $ 350.0
Issuance period two [member] | Overseas [member]  
Bonds Payable [Line Items]  
Overseas unsecured bonds $ 1,150.0
Overseas unsecured bonds [member] | Issuance period one [member]  
Bonds Payable [Line Items]  
Issuance starting period 2013-04
Issuance ending period 2016-04
Repayment and Interest Payment Bullet repayment; interest payable semi-annually
Coupon Rate 0.95%
Overseas unsecured bonds [member] | Issuance period two [member]  
Bonds Payable [Line Items]  
Issuance starting period 2013-04
Issuance ending period 2018-04
Repayment and Interest Payment Bullet repayment; interest payable semi-annually
Coupon Rate 1.625%