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Property and Equipment - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]      
Property and equipment, net $ 65,664 $ 77,852  
Accumulated depreciation 97,250 93,041  
Property and equipment, gross 162,914 170,893  
Depreciation and amortization 14,000 20,100 $ 21,000
Aircraft And Aircraft-Related Equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, net 40,000 41,500  
Accumulated depreciation 8,600 7,100  
Computer Equipment And Purchased Software      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 64,615 72,602  
Computer Equipment And Purchased Software | Assets Held under Capital Leases      
Property, Plant and Equipment [Line Items]      
Accumulated depreciation 2,300 2,500  
Property and equipment, gross $ 2,400 $ 2,900