XML 48 R36.htm IDEA: XBRL DOCUMENT v3.21.2
Leases - Additional Information (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Operating Leased Assets [Line Items]      
Operating lease, right of use asset $ 70,340   $ 73,597
Right of use asset obtained in exchange for operating lease liability 1,800 $ 700  
UNITED STATES      
Operating Leased Assets [Line Items]      
Operating lease, right of use asset 59,800   62,200
Operating lease, liability 79,400   82,900
UNITED STATES | Northern Virginia Office Space      
Operating Leased Assets [Line Items]      
Operating lease, right of use asset 57,100   59,000
Operating lease, liability 76,700   79,700
Non-US      
Operating Leased Assets [Line Items]      
Operating lease, right of use asset 10,500   11,400
Operating lease, liability $ 11,500   $ 12,200