Leases - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Sep. 30, 2019	Jan. 01, 2019
Leases [Abstract]
Operating lease assets		$ 5,894	$ 20,200
Operating lease liabilities		$ 6,003	$ 20,500
Increase in finance lease liability	$ 8,000
Increase in finance lease asset	$ 8,000