XML 86 R65.htm IDEA: XBRL DOCUMENT v3.3.1.900
Property, plant and equipment (Detail Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Abstract]      
Depreciation $ 80,117 $ 70,827 $ 66,570