XML 79 R63.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Purchase of Additional Ownership Interest in Joint Ventures - Additional Information (Detail) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 13, 2017 USD ($) | Nov. 29, 2016 USD ($) | Dec. 31, 2017 USD ($) | [1] | Sep. 30, 2017 USD ($) | [1] | Jun. 30, 2017 USD ($) | [1] | Mar. 31, 2017 USD ($) | [1] | Dec. 31, 2016 USD ($) | [1] | Sep. 30, 2016 USD ($) | [1] | Jun. 30, 2016 USD ($) | [1] | Mar. 31, 2016 USD ($) | [1] | Dec. 31, 2017 USD ($) Location | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jul. 31, 2011
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  | $ 964,345 | $ 1,229,591 | $ 1,275,924 | $ 872,095 | $ 913,611 | $ 1,241,232 | $ 1,214,435 | $ 851,424 | $ 4,341,955 | [1] | $ 4,220,702 | [1] | $ 4,113,239 |
MEXICO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 152,668 |  | $ 140,278 |  | $ 138,354 |
Carrier Enterprise II |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional ownership interest acquired | 10.00% | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | $ 545,000 |  |  |  |  |
Cash consideration | $ 42,688 | $ 42,909 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Controlling interest, ownership percentage | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.00%
Carrier Enterprise II | Northeast U.S. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of locations | Location |  |  |  |  |  |  |  |  |  |  | 40 |  |  |  |  |
Carrier Enterprise II | MEXICO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of locations | Location |  |  |  |  |  |  |  |  |  |  | 14 |  |  |  |  |
[1] | Sales of residential central air conditioners, heating equipment and parts and supplies are seasonal. Demand related to the residential central air conditioning replacement market is typically highest in the second and third quarters, and demand for heating equipment is usually highest in the fourth quarter. Demand related to the new construction sectors throughout most of the markets is fairly evenly distributed throughout the year except for dependence on housing completions and related weather and economic conditions.

X
- 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_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Additional Ownership Interest Percentage Acquired + References No definition available. + Details
Name: | wso_AdditionalOwnershipInterestPercentageAcquired
Namespace Prefix: | wso_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of locations. + References No definition available. + Details
Name: | wso_NumberOfLocations
Namespace Prefix: | wso_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementGeographicalAxis=country_MX
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=wso_CarrierEnterpriseTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=wso_NortheastUnitedStatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |