Leases - Schedule of Future Minimum Lease Payments Under Non-cancelable Leases (Detail) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Operating Lease
Remainder of 2019	$ 14,118,000
2020	14,758,000
2021	12,225,000
2022	9,466,000
2023	6,460,000
After 2023	20,913,000
Total lease payments	77,940,000
Less: Interest	(9,537,000)
Present value of lease liabilities	68,403,000
Finance Lease
Remainder of 2019	930,000
2020	1,150,000
2021	432,000
Total lease payments	2,512,000
Less: Interest	(124,000)
Present value of lease liabilities	2,388,000	$ 2,920,000
Total
Remainder of 2019	15,048,000
2020	15,908,000
2021	12,657,000
2022	9,466,000
2023	6,460,000
After 2023	20,913,000
Total lease payments	80,452,000
Less: Interest	(9,661,000)
Present value of lease liabilities	$ 70,791,000