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Commitments, Contingencies and Guarantees - Additional Information (Detail) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Loss Contingencies [Line Items]    
Self insurance accrued in health care claims $ 800,000  
Contingent liability
Indemnification [Member]    
Loss Contingencies [Line Items]    
Contingent liability 0  
Guarantees [Member]    
Loss Contingencies [Line Items]    
Guarantee liability 1,700,000  
Contingent liability $ 0