Recent Accounting Guidance - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease liabilities	$ 30,134
Operating lease ROU assets	$ 28,878
ASU 2016-02 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease liabilities		$ 30,100
Operating lease ROU assets		$ 29,100