Annual report pursuant to Section 13 and 15(d)

Estimated Useful Lives of Assets (Parenthetical) (Detail)

v3.3.1.900
Estimated Useful Lives of Assets (Parenthetical) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Accumulated depreciation and amortization $ 1,182,322 $ 1,098,280
Property Under Capital Lease    
Property, Plant and Equipment [Line Items]    
Accumulated depreciation and amortization $ 150,968 $ 133,022