Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Basis Of Presentation Use Of Estimates And Recent Accounting Policies [Line Items]
Operating lease assets	$ 25,256
Accounting Standards Update 2016-02 [Member]
Basis Of Presentation Use Of Estimates And Recent Accounting Policies [Line Items]
Operating lease assets		$ 26,300
Operating lease liabilities		$ 26,500