Commitments and Contingencies - Future Minimum Lease Payments under Lease Obligations (Detail) $ in Thousands	Dec. 31, 2018 USD ($)
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Capital lease obligation, 2019	$ 2,507
Capital lease obligation, 2020	1,983
Capital lease obligation, 2021	1,844
Capital lease obligation, 2022	1,630
Capital lease obligation, 2023	204
Capital lease obligation, Thereafter	0
Total minimal leases payments, Capital Leases	8,168
Less: Interest	(605)
Present value of minimal lease payments	7,563
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating lease obligation, 2019	16,538
Operating lease obligation, 2020	13,850
Operating lease obligation, 2021	13,044
Operating lease obligation, 2022	11,737
Operating lease obligation, 2023	9,741
Operating lease obligation, Thereafter	37,997
Total minimal leases payments, Operating Leases	102,907
Schedule of Total Future Minimum Lease Payments [Abstract]
Total lease, 2019	19,045
Total lease, 2020	15,833
Total lease, 2021	14,888
Total lease, 2022	13,367
Total lease, 2023	9,945
Total lease, Thereafter	37,997
Total minimal leases payments	$ 111,075

Schedule Of Future Minimum Lease Payments [Abstract]

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Amount of minimum lease payments for capital leases.

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Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount necessary to reduce net minimum lease payments to present value for capital leases.

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Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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