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Summary of Future Purchase Obligations and Minimum Rental Commitments for Leasehold Properties and Operating Leases with Non-Cancelable Terms (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Other Commitments [Line Items]  
2018 $ 6,631
2019 1,759
2020 372
2021 40
Operating Leases, Future Minimum Payments Due, Total 8,802
Minimum rental commitments for leasehold properties  
Other Commitments [Line Items]  
2018 1,226
2019 436
2020 372
2021 40
Operating Leases, Future Minimum Payments Due, Total 2,074
Commitments for other lease obligations  
Other Commitments [Line Items]  
2018 3,168
2019 1,323
Operating Leases, Future Minimum Payments Due, Total 4,491
Other purchase obligations  
Other Commitments [Line Items]  
2018 2,237
Operating Leases, Future Minimum Payments Due, Total $ 2,237