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v3.20.2

Other Commitments and Contingencies (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Outstanding Bonds |  |
Performance bonds | $ 98,435 | $ 87,286
Licensing, insurance, and other bonds | 25,528 | 25,309
Total bonds | $ 123,963 | $ 112,595

X
- Definition The amount of bonds outstanding at the end of the reporting period. + References No definition available. + Details
Name: | bld_BondsOutstanding
Namespace Prefix: | bld_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the amount of other type of bonds outstanding, principally license and insurance related. + References No definition available. + Details
Name: | bld_LicenseAndInsuranceRelatedAndOtherBondsOutstanding
Namespace Prefix: | bld_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | bld_OutstandingBondsAbstract
Namespace Prefix: | bld_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of performance bonds outstanding. + References No definition available. + Details
Name: | bld_PerformanceBondsOutstanding
Namespace Prefix: | bld_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant