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CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
CONSOLIDATED STATEMENTS OF EQUITY |  |  |
Issuance of restricted share awards under long-term equity incentive plan (in shares) | 90,760 | 158,900 | 756,590
Repurchase of shares of common stock pursuant to Share Repurchase Program (in shares) | 252,946 | 858,393 | 673,626
Repurchase of shares of common stock pursuant to the settlement of Accelerated Share Repurchase Program (in shares) | 13,657 |  |
Repurchase of shares of common stock pursuant to Accelerated Share Repurchase Program (in shares) | 796,925 | 1,507,443 |
Number of shares of common stock withheld to satisfy statutory withholding requirements (in shares) | 98,056 | 123,101 | 66,196

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- Definition Number of shares that have been repurchased during the period pursuant to the Accelerated Share Repurchase Program and are being held in treasury. + References No definition available. + Details
Name: | bld_TreasuryStockSharesAcquiredCostMethodAcceleratedShareRepurchaseProgram
Namespace Prefix: | bld_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares that have been repurchased during the period pursuant to the settlement of a Accelerated Share Repurchase Program. + References No definition available. + Details
Name: | bld_TreasuryStockSharesAcquiredCostMethodSettlementOfAcceleratedShareRepurchaseProgram
Namespace Prefix: | bld_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares that have been repurchased during the period pursuant to the Share Repurchase Program and are being held in treasury. + References No definition available. + Details
Name: | bld_TreasuryStockSharesAcquiredCostMethodShareRepurchaseProgram
Namespace Prefix: | bld_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
Name: | us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration