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Acquisitions and Dispositions - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Business Combinations [Abstract] |  |
Purchase of non-controlling interests | $ 409 | $ 274

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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