Litigation and Regulatory Contingencies (Narrative) (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($) Transaction
Loss Contingencies [Line Items]
Loss contingency, pending claims, number | Transaction	129
Loss contingency, damages sought, value	$ 3,100
Loss contingency damages sought premium taxes	38,000
Loss contingency estimated recovery	2,800
Canadian Taxing Authority
Loss Contingencies [Line Items]
Income tax authority assessment	$ 14,300