Commitments, Contingencies and Guarantees - Additional Information (Detail) - USD ($) shares in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Lease expiration year	2030
Total amount of sublease payments to be received	$ 3,700,000
Rent expense	72,500,000	$ 56,600,000	$ 58,600,000
Liability for future lease payments, net of anticipated sublease rental income	$ 530,033,000
Consideration transferred of Class A common stock	0.2	0.5	2.0
Estimated fair value of contingent consideration	$ 8,000,000	$ 15,200,000	$ 34,200,000
Limited partnership units	1.2	1.8	4.9
Business acquisition, contingent cash consideration	$ 18,500,000	$ 22,800,000	$ 34,000,000
Business acquisition, contingent cash consideration	36,800,000
Self insurance accrued in health care claims	800,000
Contingent liability
Class A Common Stock [Member]
Loss Contingencies [Line Items]
Estimated fair value of contingent consideration	$ 1,600,000	4,100,000	$ 15,800,000
Business acquisition, equity interest issued, number of shares	1.9
Limited Partnership Units [Member]
Loss Contingencies [Line Items]
Business acquisition, equity interest issued, number of shares	5.8
Indemnification [Member]
Loss Contingencies [Line Items]
Contingent liability	$ 0
Vacant Space [Member]
Loss Contingencies [Line Items]
Liability for future lease payments, net of anticipated sublease rental income	0	$ 5,900,000
Guarantees [Member]
Loss Contingencies [Line Items]
Guarantee liability	1,600,000
Contingent liability	0
Contingent Consideration Issuable [Member]
Loss Contingencies [Line Items]
Business acquisition, contingent cash consideration	$ 22,700,000
Contingent Consideration Issuable [Member] | Class A Common Stock [Member]
Loss Contingencies [Line Items]
Business acquisition, equity interest issued, number of shares	7.7
Contingent Consideration Issuable [Member] | Limited Partnership Units [Member]
Loss Contingencies [Line Items]
Business acquisition, equity interest issued, number of shares	4.5