Commitments and Contingencies - Summary of Contractual Commitments (Detail) $ in Thousands	Dec. 31, 2019 USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating lease obligations, 2020	$ 3,715
Operating lease obligations, 2021	2,275
Operating lease obligations, 2022	4,714
Operating lease obligations, 2023	4,817
Operating lease obligations, 2024	4,919
Operating lease obligations, Thereafter	35,418
Total	55,858
Operating Leases, Sublease Income, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Sublease income, 2020	(991)
Sublease income, 2021	0
Sublease income, 2022	0
Sublease income 2023	0
Sublease income, 2024	0
Sublease income, Thereafter	0
Sublease income, Total	(991)
Operating Leases Future Minimum Payments Due Net [Abstract]
Net operating lease commitments, 2020	2,724
Net operating lease commitments, 2021	2,275
Net operating lease commitments, 2022	4,714
Net operating lease commitments, 2023	4,817
Net operating lease commitments, 2024	4,919
Net operating lease commitments, Thereafter	35,418
Net operating lease commitments, Net	54,867
Purchase Obligation, Fiscal Year Maturity [Abstract]
Purchase commitments, 2020	14,759
Purchase commitments, 2021	6,866
Purchase commitments, 2022	5,150
Purchase commitments, 2023	3,244
Purchase commitments, 2024	1,500
Purchase commitments, Thereafter	5,625
Purchase commitments, Total	37,144
Long-term Debt, Rolling Maturity [Abstract]
Debt commitments, 2020	1,250
Debt commitments, 2021	1,250
Debt commitments, 2022	1,250
Debt commitments, 2023	1,250
Debt commitments, 2024	384,688
Debt commitments, Thereafter	0
Debt commitments, Total	389,688
Revolving Line of Credit Facility, Maturity [Abstract]
Revolving line of credit facility, 2020	10,000
Revolving line of credit facility, 2021	0
Revolving line of credit facility, 2022	0
Revolving line of credit facility, 2023	0
Revolving line of credit facility, 2024	0
Revolving line of credit facility, thereafter	0
Revolving line of credit facility, Total	10,000
Interest Payable, Fiscal Year Maturity [Abstract]
Interest payable, 2020	19,507
Interest payable, 2021	19,126
Interest payable, 2022	18,920
Interest payable, 2023	18,757
Interest payable, 2024	7,793
Interest payable, Thereafter	0
Interest payable, Total	84,103
Contractual Obligation, Fiscal Year Maturity [Abstract]
Total contractual commitments, 2020	48,240
Total contractual commitments, 2021	29,517
Total contractual commitments, 2022	30,034
Total contractual commitments, 2023	28,068
Total contractual commitments, 2024	398,900
Total contractual commitments, Thereafter	41,043
Total contractual commitments	575,802
Undiscounted lease payments	10,424
Dallas, Texas Office
Contractual Obligation, Fiscal Year Maturity [Abstract]
Undiscounted lease payments	$ 45,300