Notes Receivable from Partners - Additional Information (Detail) - Partners - USD ($) |
12 Months Ended | ||||
|---|---|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
Aug. 31, 2009 |
Jan. 31, 2008 |
|
| Related Party Transaction [Line Items] | |||||
| Term of promissory notes receivable | in the form of five or six year interest-bearing promissory notes and/or in the form of nine year interest-bearing limited recourse promissory notes | ||||
| Notes receivable from partners | $ 2,789,000 | $ 3,212,000 | $ 3,052,000 | ||
| Allowance for credit losses on notes receivable | 0 | 0 | |||
| Limited Recourse | |||||
| Related Party Transaction [Line Items] | |||||
| Interest rates of promissory notes | 2.77% | 3.53% | |||
| Notes receivable from partners | 1,214,000 | 1,300,000 | |||
| Full Recourse | |||||
| Related Party Transaction [Line Items] | |||||
| Notes receivable from partners | $ 1,575,000 | $ 1,912,000 |