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Summary of Significant Accounting Policies and Practices - Additional Information (Detail) | 3 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2015 USD ($) Segment Location Customer shares | Aug. 31, 2014 shares | May. 31, 2015 USD ($) | Nov. 30, 2010
Significant Accounting Policies [Line Items] |  |  |  |
Number of operating segments | Segment | 3 |  |  |
Number of locations in which company operates | Location | 150 |  |  |
Goodwill | $ 262,194,000 |  | $ 107,773,000 |
Number of shares estimated to be issued to acquire non-controlling interests | shares | 728,266 |  |  |
Cash payment to acquire non controlling interest | $ 5,900,000 |  |  |
Deferred tax assets recovery from future taxable income percentage | 50.00% |  |  |
Workers compensation our self-insured retention | $ 1,000,000 |  |  |
Automobile liability self-insured retention | 500,000 |  |  |
General liability claims we have an effective self-insured retention | 3,000,000 |  |  |
Medical claims, our self-insured retention | 175,000 |  |  |
Environmental liability claims, our self-insured retention | 500,000 |  |  |
Amount of earned but unbilled revenue included in accounts receivable | $ 29,700,000 |  | $ 18,400,000 |
Options to purchase shares of common stock excluded from the computation of diluted earnings per share | shares | 0 | 0 |  |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Number of customers accounted for more than specified percentage of consolidated revenues | Customer | 0 |  |  |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Minimum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of consolidated revenues | 10.00% |  |  |
Quest Integrity [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Purchase percentage of quest |  |  |  | 95.00%

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