Leases - Summary of Supplemental Balance Sheet Information Related to Leases (Detail) $ in Thousands	Mar. 31, 2019 USD ($)
Operating leases
Right-of-use assets from operating leases	$ 13,260
Operating lease liabilities, current	$ 2,452
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccountsPayableAndAccruedLiabilitiesMember
Operating lease liabilities (Note 12)	$ 10,822
Total operating lease liabilities	13,274
Finance leases
Finance leases right of use asset	$ 3,462
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentMember
Finance lease liabilities, current	$ 487
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccountsPayableAndAccruedLiabilitiesMember
Finance lease liabilities, non-current	$ 7,731
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesMember
Total finance lease liabilities	$ 8,218