XML 146 R131.htm IDEA: XBRL DOCUMENT v3.10.0.1
Contingent Liabilities - Additional Information (Detail)
Dec. 31, 2018
USD ($)
Minimum [Member]  
Loss Contingencies [Line Items]  
Range of reasonably possible losses $ 0
Maximum [Member]  
Loss Contingencies [Line Items]  
Range of reasonably possible losses $ 1,000,000