Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Detail)

v3.3.1.900
Commitments and Contingencies - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
May. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Loss Contingencies [Line Items]        
Discount rates   2.20%    
Lease rent expense   $ 10,900,000 $ 11,100,000 $ 9,700,000
Income from subleases   400,000 100,000 $ 100,000
Settlements and other related costs     4,700,000  
Lawsuit Related to Screening Services        
Loss Contingencies [Line Items]        
Estimated settlement costs     $ 0  
Office Space        
Loss Contingencies [Line Items]        
Cease-use liability   (200,000)    
Richardson, Texas | Office Space        
Loss Contingencies [Line Items]        
Term of lease (in years) 12 years      
Deferred rent   21,500,000    
San Francisco, California | General and Administrative | Office Space        
Loss Contingencies [Line Items]        
Downward adjustment to deferred rent liability   900,000    
Other Current Assets | Richardson, Texas | Office Space        
Loss Contingencies [Line Items]        
Receivable for incentives   $ 19,400,000