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Schedule of Operating Lease, Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Feb. 28, 2016
2019	$ 15,375
2020	18,967
2021	14,514
2022	10,262
2023	5,719
Thereafter	11,484
Total lease payments	76,321
Less imputed interest	(21,083)
Total lease liabilities	55,238	$ 54,300	$ 54,300
2019	19,570
2020	18,293
2021	13,578
2022	9,693
2023	5,449
Thereafter	9,472
Total lease payments	$ 76,055

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