Leases (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Lease, Cost [Abstract]
Operating lease cost	$ 19,955
Variable lease cost	6,394
Total lease cost	26,349
Operating Lease Liabilities, Payments, Due, Rolling Maturity [Abstract]
2019	55,196
2020	67,926
2021	58,219
2022	52,367
2023	43,512
Thereafter	142,322
Total minimum lease payments	419,542
Less imputed interest	71,356
Lease liability	348,186
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019		$ 75,227
2020		62,974
2021		47,552
2022		38,352
2023		26,580
Thereafter		67,140
Operating Leases, Future Minimum Payments Due		$ 317,825
Supplemental Cash Flow Information Related to Leases [Abstract]
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	18,636
Cash paid for amounts included in measurement of lease liabilities	$ 19,246
Operating Lease, Weighted Average Discount Rate, Percent	4.99%
Weighted-average remaining lease term [Abstract]
Operating Lease, Weighted Average Remaining Lease Term	7 years 6 months 4 days

Supplemental Cash Flow Information Related to Leases [Abstract]

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Weighted-average remaining lease term [Abstract]

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Amount of lease cost recognized by lessee for lease contract.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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