Operating and Finance Lease Right-of-Use Assets - Components of Lease Expense (Detail) $ in Thousands  | 
12 Months Ended | 
|---|---|
| 
 Dec. 31, 2019  
USD ($) 
 | |
| Leases [Abstract] | |
| Amortization of finance lease ROU Assets | $ 96 | 
| Interest on finance lease liabilities | 9 | 
| Finance lease expense | 105 | 
| Operating lease expense | 13,845 | 
| Variable lease expense | 922 | 
| Short-term lease expense | 822 | 
| Total lease expense | $ 15,694 | 
| X | ||||||||||
- Definition Finance lease cost. No definition available. 
  | 
| X | ||||||||||
- Definition Amount of interest expense on finance lease liability. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
  | 
| X | ||||||||||
- Definition Amount of amortization expense attributable to right-of-use asset from finance lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
  | 
| X | ||||||||||
- Definition Amount of lease cost recognized by lessee for lease contract. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
  | 
| X | ||||||||||
- References No definition available. 
  | 
| X | ||||||||||
- Definition Amount of operating lease expense. Excludes sublease income. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
  | 
| X | ||||||||||
- Definition Amount of short-term lease cost, excluding expense for lease with term of one month or less. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
  | 
| X | ||||||||||
- Definition Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
  |