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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation Of Revenue [Line Items]        
Total revenue $ 5,563,529 $ 4,980,060 $ 10,562,701 $ 9,534,463
Total revenue 150,544 131,374 286,882 250,923
Total revenue 5,714,073 5,111,434 10,849,583 9,785,386
Advisory Services [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 2,028,414 1,827,732 3,726,478 3,407,617
Total revenue 150,544 131,374 286,882 250,923
Total revenue 2,178,958 1,959,106 4,013,360 3,658,540
Global Workplace Solutions [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 3,385,452 3,034,973 6,551,367 5,862,476
Total revenue 3,385,452 3,034,973 6,551,367 5,862,476
Real Estate Investments [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 149,663 117,355 284,856 264,370
Total revenue 149,663 117,355 284,856 264,370
Global Workplace Solutions [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 3,385,452 3,034,973 6,551,367 5,862,476
Global Workplace Solutions [Member] | Global Workplace Solutions [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 3,385,452 3,034,973 6,551,367 5,862,476
Advisory Leasing [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 817,788 687,386 1,440,428 1,204,895
Advisory Leasing [Member] | Advisory Services [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 817,788 687,386 1,440,428 1,204,895
Advisory Sales [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 466,558 457,376 852,213 871,108
Advisory Sales [Member] | Advisory Services [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 466,558 457,376 852,213 871,108
Property and Advisory Project Management [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 555,822 502,201 1,076,706 986,983
Property and Advisory Project Management [Member] | Advisory Services [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 555,822 502,201 1,076,706 986,983
Valuation [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 149,051 147,397 287,377 281,560
Valuation [Member] | Advisory Services [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 149,051 147,397 287,377 281,560
Commercial Mortgage Origination [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 32,111 27,856 55,684 52,138
Total revenue 107,888 92,982 205,194 176,134
Commercial Mortgage Origination [Member] | Advisory Services [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 32,111 27,856 55,684 52,138
Total revenue 107,888 92,982 205,194 176,134
Loan Servicing [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 7,084 5,516 14,070 10,933
Total revenue 42,656 38,392 81,688 74,789
Loan Servicing [Member] | Advisory Services [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 7,084 5,516 14,070 10,933
Total revenue 42,656 38,392 81,688 74,789
Investment Management [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 101,646 98,947 207,954 222,637
Investment Management [Member] | Real Estate Investments [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 101,646 98,947 207,954 222,637
Development Services [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 48,017 18,408 76,902 41,733
Development Services [Member] | Real Estate Investments [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue $ 48,017 $ 18,408 $ 76,902 $ 41,733