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Long-Lived Asset Impairment Charges (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Impairment of long-lived assets | $ 633 | $ 4,510 | $ 4,955 | $ 5,294
U.S. Operating Segment |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Impairment of long-lived assets | $ 633 | $ 4,510 | 3,963 | $ 5,294
US Intangible Assets |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Impairment of long-lived assets |  |  | $ 992 |

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