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Schedule I - Parent Company Only - Commitments, Contingencies and Guarantees - Additional Information (Detail) - USD ($) |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 19, 2019 | Apr. 08, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | May 31, 2017 | Jul. 10, 2015 | Mar. 13, 2015
3.70% [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Outstanding balance of the secured loan arrangements |  |  | $ 0 | $ 0 |  |  |
3.70% [Member] | Secured Loan Arrangements [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Debt instrument gross amount |  |  |  |  |  |  | $ 28,200,000
Stated interest rate |  |  |  |  |  |  | 3.70%
Senior Notes maturity date |  |  | Mar. 13, 2019 |  |  |  |
8.375% Senior Notes [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  | 8.375% |  |  |  |
Principal amount of notes |  |  | $ 240,000,000.0 |  |  |  |
3.44% [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Outstanding balance of the secured loan arrangements |  |  | $ 4,000,000.0 | 11,700,000 |  |  |
3.44% [Member] | Secured Loan Arrangements [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Debt instrument gross amount |  |  |  |  | $ 29,900,000 |  |
Stated interest rate |  |  |  |  | 3.44% |  |
Senior Notes maturity date |  |  | May 31, 2021 |  |  |  |
Book value of the fixed assets pledged |  |  | $ 800,000 | 2,300,000 |  |  |
3.77% [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Outstanding balance of the secured loan arrangements |  |  | 9,600,000 | 13,200,000 |  |  |
3.77% [Member] | Secured Loan Arrangements [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Debt instrument gross amount |  | $ 15,000,000.0 |  |  |  |  |
Stated interest rate |  | 3.77% |  |  |  |  |
Senior Notes maturity date |  | Apr. 08, 2023 |  |  |  |  |
Book value of the fixed assets pledged |  |  | 1,200,000 | 8,100,000 |  |  |
3.89% [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Outstanding balance of the secured loan arrangements |  |  | 6,300,000 | 8,800,000 |  |  |
3.89% [Member] | Secured Loan Arrangements [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Debt instrument gross amount | $ 10,000,000.0 |  |  |  |  |  |
Stated interest rate | 3.89% |  |  |  |  |  |
Senior Notes maturity date | Apr. 19, 2023 |  |  |  |  |  |
Book value of the fixed assets pledged |  |  | $ 2,700,000 | 5,700,000 |  |  |
Parent Company [Member] | 3.70% [Member] | Secured Loan Arrangements [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Debt instrument gross amount |  |  |  |  |  |  | $ 28,200,000
Stated interest rate |  |  |  |  |  |  | 3.70%
Senior Notes maturity date |  |  | Mar. 13, 2019 |  |  |  |
Line of credit facility, outstanding amount |  |  | $ 0 | 0 |  |  |
Parent Company [Member] | 8.375% Senior Notes [Member] | Guarantee Obligations [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 8.375% |
Principal amount of notes |  |  |  |  |  | $ 240,000,000.0 |
Parent Company [Member] | 3.44% [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Outstanding balance of the secured loan arrangements |  |  | $ 4,000,000.0 | 11,700,000 |  |  |
Parent Company [Member] | 3.44% [Member] | Secured Loan Arrangements [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Debt instrument gross amount |  |  |  |  | $ 29,900,000 |  |
Stated interest rate |  |  |  |  | 3.44% |  |
Senior Notes maturity date |  |  | May 31, 2021 |  |  |  |
Book value of the fixed assets pledged |  |  | $ 800,000 | 2,300,000 |  |  |
Parent Company [Member] | 3.77% [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Outstanding balance of the secured loan arrangements |  |  | $ 9,600,000 | 13,200,000 |  |  |
Parent Company [Member] | 3.77% [Member] | Secured Loan Arrangements [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Debt instrument gross amount |  | $ 15,000,000.0 |  |  |  |  |
Stated interest rate |  | 3.77% |  |  |  |  |
Senior Notes maturity date |  |  | Apr. 08, 2023 |  |  |  |
Book value of the fixed assets pledged |  |  | $ 1,200,000 | 8,100,000 |  |  |
Parent Company [Member] | 3.89% [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Outstanding balance of the secured loan arrangements |  |  | 6,300,000 | 8,800,000 |  |  |
Parent Company [Member] | 3.89% [Member] | Secured Loan Arrangements [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Debt instrument gross amount | $ 10,000,000.0 |  |  |  |  |  |
Stated interest rate | 3.89% |  |  |  |  |  |
Senior Notes maturity date | Apr. 19, 2023 |  |  |  |  |  |
Book value of the fixed assets pledged |  |  | $ 2,700,000 | $ 5,700,000 |  |  |

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