Leases, Commitments and Contingencies - Schedule of Condensed Consolidated Balance Sheets of Operating Leases (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019
Assets
Right-of-use operating asset	$ 35,514	$ 41,100
Liabilities
Current operating lease liabilities	7,557
Long-term operating lease liabilities	31,360
Total operating lease liabilities	$ 38,917	$ 44,200