XML 65 R50.htm IDEA: XBRL DOCUMENT v3.3.1.900
Property Plant and Equipment - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]      
Depreciation expense $ 0.2 $ 0.2 $ 0.2