Related Party Transactions - Additional Information (Detail)	Nov. 05, 2016
TLT Incorporation [Member]
Related Party Transaction [Line Items]
Percentage of ownership interest	50.00%
Walden Woods South LLC [Member]
Related Party Transaction [Line Items]
Percentage of ownership interest	31.30%
Walden Woods South LLC [Member] | Majority Shareholder [Member]
Related Party Transaction [Line Items]
Percentage of ownership interest	51.00%
President [Member] | TLT Incorporation [Member] | Minimum Range [Member]
Related Party Transaction [Line Items]
Percentage of ownership interest	24.75%
President [Member] | TLT Incorporation [Member] | Maximum Range [Member]
Related Party Transaction [Line Items]
Percentage of ownership interest	49.50%
Executive Vice President [Member] | TLT Incorporation [Member] | Minimum Range [Member]
Related Party Transaction [Line Items]
Percentage of ownership interest	49.50%
Executive Vice President [Member] | TLT Incorporation [Member] | Maximum Range [Member]
Related Party Transaction [Line Items]
Percentage of ownership interest	57.75%