Annual report pursuant to Section 13 and 15(d)

Selected Balance Sheet Data - Schedule of Other Assets (Parenthetical) (Detail)

v3.3.1.900
Selected Balance Sheet Data - Schedule of Other Assets (Parenthetical) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other Assets [Line Items]      
Weighted average interest rate for notes receivable 2.90% 2.80%  
Allowance of doubtful accounts $ 359 $ 193  
Provision for bad debt expense 281 29 $ 207
Write-off receivables $ 115 $ 59 $ 152
Minimum [Member]      
Other Assets [Line Items]      
Notes receivable due period 1 year    
Maximum [Member]      
Other Assets [Line Items]      
Notes receivable due period 5 years