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v3.20.4

Organization and Summary of Significant Accounting Policies - Schedule of Estimated Useful Life of Assets Used to Compute Depreciation Using the Straight-Line Method (Detail) | 12 Months Ended
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Dec. 31, 2020
Buildings and Other Improvements [Member] | Minimum [Member] |
Property Plant And Equipment [Line Items] |
Estimated useful lives of assets | 10 years
Buildings and Other Improvements [Member] | Maximum [Member] |
Property Plant And Equipment [Line Items] |
Estimated useful lives of assets | 20 years
Leasehold Improvements [Member] |
Property Plant And Equipment [Line Items] |
Estimated useful lives of assets | 15 years
Office Furniture and Equipment [Member] |
Property Plant And Equipment [Line Items] |
Estimated useful lives of assets | 7 years
Assets under Capital Lease [Member] | Minimum [Member] |
Property Plant And Equipment [Line Items] |
Estimated useful lives of assets | 4 years
Assets under Capital Lease [Member] | Maximum [Member] |
Property Plant And Equipment [Line Items] |
Estimated useful lives of assets | 20 years
Computer Equipment and Software [Member] | Minimum [Member] |
Property Plant And Equipment [Line Items] |
Estimated useful lives of assets | 3 years
Computer Equipment and Software [Member] | Maximum [Member] |
Property Plant And Equipment [Line Items] |
Estimated useful lives of assets | 5 years
Vehicles [Member] | Minimum [Member] |
Property Plant And Equipment [Line Items] |
Estimated useful lives of assets | 3 years
Vehicles [Member] | Maximum [Member] |
Property Plant And Equipment [Line Items] |
Estimated useful lives of assets | 6 years

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_OfficeEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_AssetsHeldUnderCapitalLeasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ComputerEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_VehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |