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Summary of Significant Accounting Policies - Minimum Future Licensing Revenues (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013
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Accounting Policies [Abstract] |
Remainder of 2013 | $ 44,071
2014 | 69,295
2015 | 46,209
2016 | 36,700
2017 | 28,274
Thereafter | 137,119
Fixed non-cancelable minimum licensing revenues | $ 361,668

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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