XML 76 R60.htm IDEA: XBRL DOCUMENT v3.6.0.2
Property and Equipment - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Depreciation and amortization expense $ 366,927,000 $ 314,096,000 $ 265,101,000
Impairment loss related to property and equipment     8,615,000
Property and equipment [Member]      
Property, Plant and Equipment [Line Items]      
Depreciation and amortization expense 151,200,000 137,200,000 122,800,000
Fair Value, Measurements, Non-recurring [Member]      
Property, Plant and Equipment [Line Items]      
Impairment loss related to property and equipment $ 0 $ 0 $ 8,615,000