Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Asset Impairment - Additional Information (Detail)

v3.6.0.2
Asset Impairment - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Asset Impairment Charges [Line Items]  
Impairment of assets $ 3,464
HDC Assets [Member]  
Asset Impairment Charges [Line Items]  
Impairment of assets $ 1,902