| Restructuring Charges (Tables) | 3 Months Ended | ||||||||||||||||||||||||||||||
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| Mar. 31, 2017 | |||||||||||||||||||||||||||||||
| Restructuring And Related Activities [Abstract] | |||||||||||||||||||||||||||||||
| Components of Accrued Restructuring Costs | The following table summarizes the accrued restructuring costs on the condensed consolidated balance sheet as of March 31, 2017 (in thousands): 
 
 
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- References No definition available. 
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- Definition Tabular disclosure of costs incurred for restructuring including, but not limited to, exit and disposal activities, remediation, implementation, integration, asset impairment, and charges against earnings from the write-down of assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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