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Legal Proceedings - Additional Information (Detail)
Mar. 31, 2017
USD ($)
Loss Contingencies [Line Items]  
Loss contingency accrual $ 5,000,000
Maximum  
Loss Contingencies [Line Items]  
Estimate of possible losses 17,000,000
Other Litigation Cases  
Loss Contingencies [Line Items]  
Estimate of possible losses $ 150,000