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Summary of Significant Accounting Policies - Minimum Future Licensing Revenues (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013
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Accounting Policies [Abstract] |
Remainder of 2013 | $ 65,836
2014 | 64,776
2015 | 42,392
2016 | 33,085
2017 | 24,975
Thereafter | 128,314
Fixed non-cancelable minimum licensing revenues | $ 359,378

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- Definition Minimum future licensing revenues, total. + References No definition available. + Details
Name: | pwr_MinimumFutureLicensingRevenues
Namespace Prefix: | pwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Minimum future licensing revenues, in first full year. + References No definition available. + Details
Name: | pwr_MinimumFutureLicensingRevenuesInFirstFullYear
Namespace Prefix: | pwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum future licensing revenues, in fourth full year. + References No definition available. + Details
Name: | pwr_MinimumFutureLicensingRevenuesInFourthFullYear
Namespace Prefix: | pwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum future licensing revenues, in second full year. + References No definition available. + Details
Name: | pwr_MinimumFutureLicensingRevenuesInSecondFullYear
Namespace Prefix: | pwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum future licensing revenues, in third full year. + References No definition available. + Details
Name: | pwr_MinimumFutureLicensingRevenuesInThirdFullYear
Namespace Prefix: | pwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum future licensing revenues, remainder of current year. + References No definition available. + Details
Name: | pwr_MinimumFutureLicensingRevenuesRemainderOfCurrentYear
Namespace Prefix: | pwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum future licensing revenues, thereafter. + References No definition available. + Details
Name: | pwr_MinimumFutureLicensingRevenuesThereafter
Namespace Prefix: | pwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration