Impact of Recently Issued Accounting Pronouncements - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Accounting Changes and Error Corrections [Abstract]
Operating lease right-of-use asset	$ 18,876	$ 18,900	$ 0
Operating lease liability	19,921	19,900
Finance lease, Right-of-use asset	853	900
Finance lease, liability	$ 888	$ 900