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Perpetual Care Trusts - Additional Information (Detail) - Variable Interest Entity, Primary Beneficiary - Perpetual care trusts - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Schedule of Available-for-sale Securities [Line Items]        
Purchases of available for sale securities     $ 161,300,000  
Sales, maturities and paydowns of available for sale securities     156,100,000  
Other Than Temporarily Impaired Securities        
Schedule of Available-for-sale Securities [Line Items]        
Other than temporary impairments loss $ 0 $ 0 $ 0 $ 0