Unconsolidated Joint Venture - Additional Information (Detail) - Title Insurance Joint Venture [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Earnings from the unconsolidated joint venture	$ 53	$ 87
Collected total distributions from joint venture	83	102
Other assets, net [Member]
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated joint venture	$ 27	$ 54