Future Minimum Rental Payments under Lease Commitments (Detail) $ in Thousands	Dec. 31, 2015 USD ($)
Leases [Abstract]
Capital Leases, 2016	$ 3,849
Capital Leases, 2017	3,929
Capital Leases, 2018	4,061
Capital Leases, 2019	3,996
Capital Leases, 2020	3,339
Capital Leases, Later years	22,055
Capital Leases, Total minimum rental	41,229
Less: Amount representing interest	(16,316)
Present value of minimum rental commitments	24,913
Less: Current portion of capital lease obligations	(1,557)
Long-term portion of capital lease obligations	23,356
Operating Leases, 2016	64,049
Operating Leases, 2017	42,989
Operating Leases, 2018	35,447
Operating Leases, 2019	29,721
Operating Leases, 2020	21,487
Operating Leases, Later years	137,692
Operating Leases, Total minimum rental	$ 331,385