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Revenues - Summary of Cumulative Adjustment Made to Consolidated Cash Flow Statement due to Changes in Accounting for Incremental Costs of Obtaining Contracts with Customers (Detail)

v3.21.2
Revenues - Summary of Cumulative Adjustment Made to Consolidated Cash Flow Statement due to Changes in Accounting for Incremental Costs of Obtaining Contracts with Customers (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Cash flows used in operating activities            
Net loss $ (46,897) $ (14,422) $ (251,038) $ (9,145) $ (19,535) $ (66,145)
(Loss)/gain from discontinued operations, net of tax 0 (511) (1,022) 28,449 28,185 (6,160)
Loss from continuing operations $ (46,897) $ (13,911) (250,016) (37,594) (47,720) (59,985)
Changes in operating assets and liabilities:            
Contract assets     1,487 (1,898) (3,796) (658)
Contract liabilities - current and long-term     (1,960) 7,932 9,019 6,573
Cash flows used in operating activities - continuing operations     (38,742) (12,510) (15,300) (33,118)
Cash flows (used in) operating activities - discontinued operations     0 (14,894) (16,374) 6,808
Net cash used in operating activities     $ (38,742) $ (27,404) (31,674) $ (26,310)
ASC 605 [Member]            
Cash flows used in operating activities            
Net loss         (19,774)  
(Loss)/gain from discontinued operations, net of tax         28,185  
Loss from continuing operations         (47,959)  
Changes in operating assets and liabilities:            
Contract assets         (3,515)  
Contract liabilities - current and long-term         8,512  
Cash flows used in operating activities - continuing operations         (15,300)  
Cash flows (used in) operating activities - discontinued operations         (16,374)  
Net cash used in operating activities         $ (31,674)