Cost and Market Value Associated with Assets Held in Perpetual Care Trusts (Detail) - Variable Interest Entity, Primary Beneficiary - Perpetual care trusts - USD ($) $ in Thousands		Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Cost		$ 319,606	$ 315,915
Gross Unrealized Gains		5,537	1,797
Gross Unrealized Losses		(3,443)	(9,908)
Fair Value		321,700	307,804
Short-term investments | Level 1
Schedule of Available-for-sale Securities [Line Items]
Cost		35,904	36,618
Fair Value		35,904	36,618
Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Cost		14,303	22,999
Gross Unrealized Gains		279	71
Gross Unrealized Losses		(570)	(846)
Fair Value		14,012	22,224
Fixed maturities | U.S. governmental securities | Level 2
Schedule of Available-for-sale Securities [Line Items]
Cost		187	126
Gross Unrealized Gains		17	14
Fair Value		204	140
Fixed maturities | Corporate debt securities | Level 2
Schedule of Available-for-sale Securities [Line Items]
Cost		14,116	22,837
Gross Unrealized Gains		262	57
Gross Unrealized Losses		(570)	(845)
Fair Value		13,808	22,049
Fixed maturities | Other debt securities | Level 2
Schedule of Available-for-sale Securities [Line Items]
Cost			36
Gross Unrealized Losses			(1)
Fair Value			35
Mutual funds-debt securities | Level 1
Schedule of Available-for-sale Securities [Line Items]
Cost		161,372	184,866
Gross Unrealized Gains		1,322	35
Gross Unrealized Losses		(2,312)	(7,180)
Fair Value		160,382	177,721
Mutual funds-equity securities | Level 1
Schedule of Available-for-sale Securities [Line Items]
Cost		36,838	68,079
Gross Unrealized Gains		2,888	1,054
Gross Unrealized Losses		(552)	(1,713)
Fair Value		39,174	67,420
Other investment funds
Schedule of Available-for-sale Securities [Line Items]
Cost	[1]	69,073
Gross Unrealized Gains	[1]	431
Fair Value	[1]	69,504
Equity securities | Level 1
Schedule of Available-for-sale Securities [Line Items]
Cost		1,476	2,319
Gross Unrealized Gains		614	636
Gross Unrealized Losses		(7)	(7)
Fair Value		2,083	2,948
Other invested assets | Level 2
Schedule of Available-for-sale Securities [Line Items]
Cost		79	473
Gross Unrealized Gains		3	1
Gross Unrealized Losses		(2)	(162)
Fair Value		80	312
Total managed investments
Schedule of Available-for-sale Securities [Line Items]
Cost		319,045	315,354
Gross Unrealized Gains		5,537	1,797
Gross Unrealized Losses		(3,443)	(9,908)
Fair Value		321,139	307,243
Assets acquired via acquisition
Schedule of Available-for-sale Securities [Line Items]
Cost		561	561
Fair Value		$ 561	$ 561

[1] Other investment funds are measured at fair value using the net asset value per share practical expedient and have not been categorized in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the balance sheet. This asset class is composed of fixed income funds and equity funds, which have a redemption period ranging from 30 to 90 days, and private credit funds, which have lockup periods ranging from six to ten years with three potential one year extensions at the discretion of the funds' general partners. As of June 30, 2016 there are $50.1 million in unfunded commitments to the private credit funds, which are callable at any time.