Leases - Schedule of Supplemental Data (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$ 15,809
Operating cash flows for finance leases	997
Financing cash flows for finance leases	846
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	3,662
Finance leases	$ 1,027