Leases - Summary of Lease Assets and Liabilities (Detail) $ in Thousands	Jun. 30, 2019 USD ($)
Assets
Operating lease assets	$ 300,698
Finance lease assets	$ 4,410
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsMember
Total lease assets	$ 305,108
Liabilities
Operating lease liabilities	325,400
Finance lease liabilities	$ 4,672
Finance Lease, Liability, Statement of Financial Position [Extensible List]	faf:NotesAndContractsPayableMember
Total lease liabilities	$ 330,072