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Acquisitions and Dispositions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Business Combinations [Abstract] |  |
Purchase of non-controlling interests | $ 274 us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest | $ 48 us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest

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

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- Definition The cash outflow during the period for redemption of redeemable noncontrolling interests. + References No definition available. + Details
Name: | us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration