Related Party Transactions - Additional Information (Detail)		12 Months Ended
	Jan. 01, 2017 USD ($) $ / Unit	Dec. 31, 2016 USD ($) $ / Unit	Dec. 31, 2015 USD ($)
Subsidiaries
Related Party Transaction [Line Items]
Recoveries incurred		$ 316,000	$ 299,000
Collection from property owners		1,129,000	1,581,000
Business Law Group [Member]
Related Party Transaction [Line Items]
Legal fees paid		146,000	95,000
Receivables from property owners ultimately payable to law firm		6,005,000	5,649,000
Monthly payment for cases		$ 7,000
Minimum fee paid per unit | $ / Unit		700
Receivable from related party		$ 1,661,000	406,000
Business Law Group [Member] | Subsequent Event [Member]
Related Party Transaction [Line Items]
Monthly payment for cases	$ 82,000
Minimum fee paid per unit | $ / Unit	700
Business Law Group [Member] | Out of Pocket Collection Costs [Member]
Related Party Transaction [Line Items]
Expenses incurred by company		$ 609,000	$ 506,000