Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019
Significant Accounting Policies [Line Items]
Lease ROU assets	$ 61,630
Lease liabilities	$ 65,268
ASC Topic 842
Significant Accounting Policies [Line Items]
Lease ROU assets		$ 55,900
Lease liabilities		$ 59,000