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Recent Accounting Pronouncements (Detail) - Accounting Standards Update 2016-09
$ in Thousands
Dec. 31, 2016
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Cumulative adjustment from implementation of ASU 2016-09 $ 4,203
Accumulated Earnings  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Cumulative adjustment from implementation of ASU 2016-09 $ 4,203