XML 69 R56.htm IDEA: XBRL DOCUMENT v3.5.0.1
Line of credit - Additional Information (Detail)
$ in Millions
1 Months Ended
May 31, 2015
USD ($)
Line of Credit Facility [Line Items]  
Line of Credit Facility, Interest Rate During Period 3.00%
Line of Credit Facility, Expiration Date May 30, 2017
Letter of Credit  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Amount Outstanding $ 5.0