Revenues - Deferred Revenue Balances (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred Revenue Disclosure [Abstract]
Deferred revenue, including long-term portion	$ 114,416	$ 111,181
Less: Deferred revenue, long-term portion, included in other liabilities	10,000	10,071
Deferred revenue, short-term portion	$ 104,416	$ 101,110