American National 10-Q 8 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Nov. 01, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Trading Symbol	ANAT
Entity Registrant Name	AMERICAN NATIONAL INSURANCE CO /TX/
Entity Central Index Key	904,163
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		26,931,884

Consolidated Statements of Fina

Consolidated Statements of Financial Position - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
ASSETS
Fixed maturity, bonds held-to-maturity, at amortized cost (Fair value $7,621,182 and $7,496,692)	$ 7,342,224	$ 7,251,385
Fixed maturity, bonds available-for-sale, at fair value (Amortized cost $5,825,198 and $5,668,984)	6,045,230	5,803,276
Equity securities, at fair value (Cost $764,147 and $732,433)	1,702,303	1,541,676
Mortgage loans on real estate, net of allowance	4,782,803	4,348,046
Policy loans	376,850	384,376
Investment real estate, net of accumulated depreciation of $257,552 and $259,578	549,264	593,417
Short-term investments	561,773	192,226
Other invested assets	110,926	113,550
Total investments	21,471,373	20,227,952
Cash and cash equivalents	350,728	289,338
Investments in unconsolidated affiliates	527,439	490,476
Accrued investment income	183,918	180,323
Reinsurance recoverables	408,772	401,709
Prepaid reinsurance premiums	65,526	63,026
Premiums due and other receivables	335,430	296,930
Deferred policy acquisition costs	1,352,299	1,294,443
Property and equipment, net	116,649	116,028
Current tax receivable	39,851	61,423
Other assets	146,024	169,962
Separate account assets	933,811	941,612
Total assets	25,931,820	24,533,222
LIABILITIES
Life	2,991,592	2,939,308
Annuity	1,369,352	1,277,220
Accident and health	57,995	60,308
Policyholders' account balances	11,827,574	11,068,775
Policy and contract claims	1,365,155	1,303,925
Unearned premium reserve	893,069	823,938
Other policyholder funds	328,707	318,620
Liability for retirement benefits	130,291	152,496
Notes payable	138,165	136,080
Deferred tax liabilities, net	476,433	367,487
Other liabilities	536,130	481,958
Separate account liabilities	933,811	941,612
Total liabilities	21,048,274	19,871,727
American National stockholders' equity:
Common stock, $1.00 par value,-Authorized 50,000,000, Issued 30,832,449 and 30,832,449 Outstanding 26,931,884 and 26,914,516 shares	30,832	30,832
Additional paid-in capital	18,988	16,406
Accumulated other comprehensive income	592,231	455,899
Retained earnings	4,333,637	4,250,818
Treasury stock, at cost	(101,616)	(101,777)
Total American National stockholders' equity	4,874,072	4,652,178
Noncontrolling interest	9,474	9,317
Total equity	4,883,546	4,661,495
Total liabilities and equity	$ 25,931,820	$ 24,533,222

Consolidated Statements of Fin3

Consolidated Statements of Financial Position (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Fair value of bonds held-to-maturity	$ 7,621,182	$ 7,496,692
Amortized cost of bonds available-for-sale	5,825,198	5,668,984
Cost of equity securities	764,147	732,433
Accumulated depreciation of investment real estate	$ 257,552	$ 259,578
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	30,832,449	30,832,449
Common stock, shares outstanding	26,931,884	26,914,516

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Premiums
Life	$ 84,862	$ 83,521	$ 241,623	$ 235,691
Annuity	65,007	61,279	160,205	217,517
Accident and health	41,832	43,879	115,464	131,020
Property and casualty	345,816	318,658	1,006,516	926,807
Other policy revenues	54,030	64,210	183,558	194,046
Net investment income	241,205	227,784	704,326	634,548
Net realized investment gains	33,929	22,181	59,338	38,209
Other-than-temporary impairments	(3,485)	(5,914)	(11,737)	(12,941)
Other income	9,554	7,544	27,347	23,663
Total premiums and other revenues	872,750	823,142	2,486,640	2,388,560
Policyholder benefits
Life	101,847	103,873	299,864	296,398
Annuity	78,039	75,132	199,499	250,034
Claims incurred
Accident and health	28,385	39,375	76,171	101,994
Property and casualty	238,178	233,474	719,888	676,392
Interest credited to policyholders' account balances	104,699	87,973	295,255	250,401
Commissions for acquiring and servicing policies	141,645	122,382	408,576	350,211
Other operating expenses	121,615	118,755	389,563	378,328
Change in deferred policy acquisition costs	(32,225)	(5,544)	(69,407)	(26,708)
Total benefits, losses and expenses	782,183	775,420	2,319,409	2,277,050
Income before federal income tax and equity in earnings of unconsolidated affiliates	90,567	47,722	167,231	111,510
Less: Provision (benefit) for federal income taxes
Current	22,980	(8,259)	26,924	(5,370)
Deferred	13,371	30,849	33,014	33,780
Total provision for federal income taxes	36,351	22,590	59,938	28,410
Equity in earnings of unconsolidated affiliates	22,387	36,530	44,200	39,265
Net income	76,603	61,662	151,493	122,365
Less: Net income attributable to noncontrolling interest, net of tax	3,334	2,373	2,425	1,135
Net income attributable to American National	$ 73,269	$ 59,289	$ 149,068	$ 121,230
Earnings per share
Basic	$ 2.72	$ 2.20	$ 5.54	$ 4.51
Diluted	2.72	2.20	5.53	4.50
Cash dividends to common stockholders	$ 0.82	$ 0.82	$ 2.46	$ 2.44
Weighted average common shares outstanding	26,894,538	26,908,032	26,895,952	26,908,619
Weighted average common shares outstanding and dilutive potential common shares	26,958,664	26,967,331	26,959,227	26,966,387

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 76,603	$ 61,662	$ 151,493	$ 122,365
Other comprehensive income (loss), net of tax
Change in net unrealized gains on securities	29,774	25,290	126,362	156,066
Foreign currency transaction and translation adjustments	411	(1,101)	694	(671)
Defined benefit pension plan adjustment	1,535	2,128	9,276	6,384
Other comprehensive income, net of tax	31,720	26,317	136,332	161,779
Total comprehensive income	108,323	87,979	287,825	284,144
Less: Comprehensive income attributable to noncontrolling interest	3,334	2,373	2,425	1,135
Total comprehensive income attributable to American National	$ 104,989	$ 85,606	$ 285,400	$ 283,009

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]
Balance at beginning of the period at Dec. 31, 2015		$ 30,832	$ 13,689	$ 352,620	$ 4,157,184	$ (102,043)	$ 10,189
Reissuance of treasury shares			1,825			266
Contributions							1
Net income attributable to American National	$ 121,230				121,230
Other comprehensive income	161,779			161,779
Income tax effect from restricted stock arrangement			49
Distributions							(2,323)
Cash dividends to common stockholders					(65,665)
Amortization of restricted stock			631
Net gain attributable to noncontrolling interest							1,135
Balance at end of the period at Sep. 30, 2016	4,681,399		16,194	514,399	4,212,749	(101,777)	9,002
Balance at beginning of the period at Dec. 31, 2016	4,661,495	30,832	16,406	455,899	4,250,818	(101,777)	9,317
Reissuance of treasury shares			1,964			161
Contributions							224
Net income attributable to American National	149,068				149,068
Other comprehensive income	136,332			136,332
Distributions							(2,492)
Cash dividends to common stockholders					(66,249)
Amortization of restricted stock			618
Net gain attributable to noncontrolling interest							2,425
Balance at end of the period at Sep. 30, 2017	$ 4,883,546	$ 30,832	$ 18,988	$ 592,231	$ 4,333,637	$ (101,616)	$ 9,474

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
OPERATING ACTIVITIES
Net income	$ 151,493	$ 122,365
Adjustments to reconcile net income to net cash provided by operating activities
Net realized investment gains	(59,338)	(38,209)
Other-than-temporary impairments	11,737	12,941
Amortization (accretion) of premiums, discounts and loan origination fees	(4,233)	(1,301)
Net capitalized interest on policy loans and mortgage loans	(25,218)	(23,344)
Depreciation	41,131	36,811
Interest credited to policyholders' account balances	295,255	250,401
Charges to policyholders' account balances	(183,558)	(194,046)
Deferred federal income tax expense	33,014	33,780
Equity in earnings of unconsolidated affiliates	(44,200)	(39,265)
Distributions from equity method investments	1,133	827
Changes in Policyholder liabilities	273,411	266,909
Deferred policy acquisition costs	(69,407)	(26,708)
Reinsurance recoverables	(7,063)	(9,103)
Premiums due and other receivables	(38,499)	(23,532)
Prepaid reinsurance premiums	(2,500)	8,883
Accrued investment income	(3,596)	(2,869)
Current tax receivable/payable	21,571	(47,883)
Liability for retirement benefits	(7,934)	(11,360)
Other, net	(11,838)	14,463
Net cash provided by operating activities	371,361	329,760
INVESTING ACTIVITIES
Held-to-maturity securities	599,202	362,950
Available-for-sale securities	433,514	394,436
Investment real estate	46,745	12,879
Mortgage loans	431,702	396,783
Policy loans	39,003	46,194
Other invested assets	62,815	22,918
Disposals of property and equipment	554	8,677
Distributions from unconsolidated affiliates	12,561	40,464
Held-to-maturity securities	(690,190)	(112,679)
Available-for-sale securities	(535,617)	(575,299)
Investment real estate	(27,527)	(38,611)
Mortgage loans	(848,263)	(1,010,671)
Policy loans	(18,953)	(18,693)
Other invested assets	(33,062)	(51,516)
Additions to property and equipment	(19,162)	(24,337)
Contributions to unconsolidated affiliates	(23,267)	(107,998)
Change in short-term investments	(369,547)	55,149
Change in collateral held for derivatives	29,797	14,032
Other, net	19,055	14,040
Net cash used in investing activities	(890,640)	(571,282)
FINANCING ACTIVITIES
Policyholders' account deposits	1,607,263	1,197,460
Policyholders' account withdrawals	(960,161)	(969,989)
Change in notes payable	2,084	17,631
Dividends to stockholders	(66,249)	(65,665)
Payments to noncontrolling interest	(2,268)	(2,322)
Net cash provided by financing activities	580,669	177,115
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	61,390	(64,407)
Beginning of the period	289,338	310,930
Cash at end of period	$ 350,728	$ 246,523

Nature of Operations

Nature of Operations	9 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	Note 1 – Nature of Operations American National Insurance Company and its consolidated subsidiaries (collectively “American National” or “the Company”) offer a broad spectrum of insurance products, including individual and group life insurance, annuities, health insurance, and property and casualty insurance. Business is conducted in all 50 states, the District of Columbia and Puerto Rico.

Summary of Significant Accounti

Summary of Significant Accounting Policies and Practices	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies and Practices	Note 2 – Summary of Significant Accounting Policies and Practices The consolidated financial statements and notes thereto have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) and are reported in U.S. currency. American National consolidates entities that are wholly-owned and those in which American National owns less than 100% but controls, as well as variable interest entities in which American National is the primary beneficiary. Intercompany balances and transactions with consolidated entities have been eliminated. Investments in unconsolidated affiliates are accounted for using the equity method of accounting. Certain amounts in prior years have been reclassified to conform to current year presentation. The interim consolidated financial statements and notes herein are unaudited and reflect all adjustments which management considers necessary for the fair presentation of the interim consolidated statements of financial position, operations, comprehensive income, changes in equity, and cash flows. The interim consolidated financial statements and notes should be read in conjunction with the annual consolidated financial statements and notes thereto included in American National’s Annual Report on Form 10-K The preparation of the consolidated financial statements in conformity with GAAP requires the use of estimates and assumptions that affect the reported consolidated financial statement balances. Actual results could differ from those estimates. Revision to Previously Reported Amounts Correction of an Immaterial Error. Materiality, Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements 10-K . Financial statement amounts previously reported were revised as shown below (in thousands): Nine months ended September 30, 2016 As Reported As Revised Effect of Change Statement of Cash Flow Change in collateral held for derivatives $ — $ 14,032 $ 14,032 Other investing activities, net 9,242 14,040 4,798 Net cash used in investing activities (590,112 ) (571,282 ) 18,830 Net decrease in cash and cash equivalents (83,237 ) (64,407 ) 18,830 Cash at beginning of period 190,237 310,930 120,693 Cash at end of period 107,000 246,523 139,523

Recently Issued Accounting Pron

Recently Issued Accounting Pronouncements	9 Months Ended
	Sep. 30, 2017
Accounting Changes and Error Corrections [Abstract]
Recently Issued Accounting Pronouncements	Note 3 – Recently Issued Accounting Pronouncements Future Adoption of New Accounting Standards In May 2014, the FASB issued guidance that will supersede most existing revenue recognition requirements in GAAP. Insurance contracts generally are excluded from the scope of the guidance. For those contracts which are impacted, the transaction price is attributed to the underlying performance obligations in the contract and revenue is recognized as the entity satisfies the performance obligations and transfers control of a good or service to the customer. The standard is effective for annual periods and interim periods within those annual periods beginning after December 15, 2017. The Company intends to adopt the standard effective January 1, 2018 using a modified retrospective approach. Since the majority of our revenues sources are insurance related and, accordingly, not in scope of the standard, we do not expect the adoption of the standard to be material to the Company’s results of operations or financial position. The Company is continuing to identify those contracts which are in the scope of the standard and assessing the impact of those non-insurance In January 2016, the FASB issued guidance that will change certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. The new guidance requires that equity investments in unconsolidated entities be measured at fair value and the changes in fair value are recognized through earnings. When the fair value option has been elected for financial liabilities, changes in fair value due to instrument-specific credit risk will be recognized separately in other comprehensive income. The guidance also simplifies the impairment assessment of equity investments and eliminates the disclosure requirements for methods and significant assumptions used to estimate fair value of financial instruments that are measured at amortized cost on the statement of financial position. The standard is effective for annual periods and interim periods within those annual periods beginning after December 15, 2017. The Company is currently evaluating the impact of adoption to the Company’s results of operations and financial position. The impact, if the guidance were effective in 2017, is an increase of $129 million in net investment income from the change in unrealized gains and losses on securities in the equity portfolio. The cumulative unrealized gains and losses at adoption will be reclassified from other comprehensive income to retained earnings. In February 2016, the FASB issued guidance that will require significant changes to the statement of financial position of lessees. With certain limited exceptions, lessees will need to recognize virtually all of their leases on the statement of financial position, by recording a right-of-use In June 2016, the FASB issued guidance that will significantly change how entities measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. The guidance will replace the current “incurred loss” approach with an “expected loss” model for instruments measured at amortized cost. For available-for-sale In March 2017, the FASB issued guidance on the presentation of net periodic pension and postretirement benefit costs. The guidance requires the service cost component to be reported in the same line item as other compensation costs. All other components of net benefit cost are required to be presented in the income statement separately from the service cost component and outside of income from operations. The standard is effective for annual periods, including interim periods within those annual periods beginning after December 15, 2017. The Company plans to adopt the standard effective January 1, 2018. Considering the Company’s defined benefit pension plans are frozen, this guidance is not expected to have a material impact to the Company’s results of operations or financial position.

Investment in Securities

Investment in Securities	9 Months Ended
	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Investment in Securities	Note 4 – Investment in Securities The cost or amortized cost and fair value of investments in securities are shown below (in thousands): September 30, 2017 Cost or Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value Fixed maturity securities, bonds held-to-maturity U.S. states and political subdivisions $ 271,297 $ 14,759 $ (22 ) $ 286,034 Foreign governments 4,023 657 — 4,680 Corporate debt securities 6,831,509 268,231 (15,252 ) 7,084,488 Residential mortgage-backed securities 232,678 11,504 (1,028 ) 243,154 Collateralized debt securities 925 50 — 975 Other debt securities 1,792 59 — 1,851 Total bonds held-to-maturity 7,342,224 295,260 (16,302 ) 7,621,182 Fixed maturity securities, bonds available-for-sale U.S. treasury and government 28,221 536 (41 ) 28,716 U.S. states and political subdivisions 892,998 32,890 (1,343 ) 924,545 Foreign governments 5,000 1,506 — 6,506 Corporate debt securities 4,868,920 200,900 (15,224 ) 5,054,596 Residential mortgage-backed securities 15,149 47 (173 ) 15,023 Collateralized debt securities 3,285 674 (4 ) 3,955 Other debt securities 11,625 440 (176 ) 11,889 Total bonds available-for-sale 5,825,198 236,993 (16,961 ) 6,045,230 Equity securities Common stock 745,018 940,944 (7,434 ) 1,678,528 Preferred stock 19,129 4,646 — 23,775 Total equity securities 764,147 945,590 (7,434 ) 1,702,303 Total investments in securities $ 13,931,569 $ 1,477,843 $ (40,697 ) $ 15,368,715 December 31, 2016 Cost or Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value Fixed maturity securities, bonds held-to-maturity U.S. states and political subdivisions $ 301,994 $ 17,190 $ (102 ) $ 319,082 Foreign governments 4,057 659 — 4,716 Corporate debt securities 6,711,508 253,191 (38,721 ) 6,925,978 Residential mortgage-backed securities 229,758 14,112 (1,185 ) 242,685 Collateralized debt securities 1,290 64 — 1,354 Other debt securities 2,778 99 — 2,877 Total bonds held-to-maturity 7,251,385 285,315 (40,008 ) 7,496,692 Fixed maturity securities, bonds available-for-sale U.S. treasury and government 25,062 594 (16 ) 25,640 U.S. states and political subdivisions 945,431 21,170 (6,378 ) 960,223 Foreign governments 5,000 1,567 — 6,567 Corporate debt securities 4,666,096 145,716 (31,049 ) 4,780,763 Residential mortgage-backed securities 18,588 2,267 (342 ) 20,513 Collateralized debt securities 5,574 821 (3 ) 6,392 Other debt securities 3,233 — (55 ) 3,178 Total bonds available-for-sale 5,668,984 172,135 (37,843 ) 5,803,276 Equity securities Common stock 713,099 810,611 (5,195 ) 1,518,515 Preferred stock 19,334 3,889 (62 ) 23,161 Total equity securities 732,433 814,500 (5,257 ) 1,541,676 Total investments in securities $ 13,652,802 $ 1,271,950 $ (83,108 ) $ 14,841,644 The amortized cost and fair value, by contractual maturity, of fixed maturity securities are shown below (in thousands): September 30, 2017 Bonds Held-to-Maturity Bonds Available-for-Sale Amortized Cost Fair Value Amortized Cost Fair Value Due in one year or less $ 403,881 $ 410,402 $ 234,115 $ 237,826 Due after one year through five years 3,715,433 3,898,649 1,680,069 1,761,874 Due after five years through ten years 2,772,273 2,850,963 3,300,320 3,421,349 Due after ten years 444,787 456,149 610,694 624,181 Without single maturity date 5,850 5,019 — — Total $ 7,342,224 $ 7,621,182 $ 5,825,198 $ 6,045,230 Actual maturities differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Residential and commercial mortgage-backed securities, which are not due at a single maturity, have been allocated to their respective categories based on the year of final contractual maturity. Proceeds from sales of available-for-sale Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Proceeds from sales of available-for-sale $ 72,910 $ 36,950 $ 117,467 $ 79,681 Gross realized gains 31,397 12,990 46,385 21,574 Gross realized losses (4,837 ) (244 ) (4,983 ) (582 ) Gains and losses are determined using specific identification of the securities sold. During the nine months ended September 30, 2017, bonds with a carrying value of $25,266,000 transferred from held-to-maturity available-for-sale held-to-maturity available-for-sale. The components of the change in net unrealized gains (losses) on securities are shown below (in thousands): Nine months ended September 30, 2017 2016 Bonds available-for-sale $ 85,740 $ 268,148 Equity securities 128,913 55,529 Change in net unrealized gains on securities during the year 214,653 323,677 Adjustments for Deferred policy acquisition costs (11,551 ) (70,426 ) Participating policyholders’ interest (9,140 ) (13,472 ) Deferred federal income tax expense (67,600 ) (83,713 ) Change in net unrealized gains on securities, net of tax $ 126,362 $ 156,066 The gross unrealized losses and fair value of the investment securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, are shown below (in thousands): September 30, 2017 Less than 12 months 12 Months or more Total Unrealized (Losses) Fair Value Unrealized (Losses) Fair Value Unrealized (Losses) Fair Value Fixed maturity securities, bonds held-to-maturity U.S. states and political subdivisions $ (22 ) $ 3,030 $ — $ — $ (22 ) $ 3,030 Corporate debt securities (6,134 ) 521,274 (9,118 ) 147,053 (15,252 ) 668,327 Residential mortgage-backed securities (527 ) 57,465 (501 ) 9,249 (1,028 ) 66,714 Total bonds held-to-maturity (6,683 ) 581,769 (9,619 ) 156,302 (16,302 ) 738,071 Fixed maturity securities, bonds available-for-sale U.S. treasury and government (41 ) 21,969 — — (41 ) 21,969 U.S. states and political subdivisions (366 ) 39,274 (977 ) 27,202 (1,343 ) 66,476 Corporate debt securities (4,267 ) 361,101 (10,957 ) 134,308 (15,224 ) 495,409 Residential mortgage-backed securities (46 ) 12,570 (127 ) 1,492 (173 ) 14,062 Collateralized debt securities — — (4 ) 127 (4 ) 127 Other Debt Securities (176 ) 9,472 — — (176 ) 9,472 Total bonds available-for-sale (4,896 ) 444,386 (12,065 ) 163,129 (16,961 ) 607,515 Equity securities Common stock (7,434 ) 64,921 — — (7,434 ) 64,921 Total equity securities (7,434 ) 64,921 — — (7,434 ) 64,921 Total $ (19,013 ) $ 1,091,076 $ (21,684 ) $ 319,431 $ (40,697 ) $ 1,410,507 December 31, 2016 Less than 12 months 12 Months or more Total Unrealized Fair Value Unrealized (Losses) Fair Value Unrealized (Losses) Fair Fixed maturity securities, bonds held-to-maturity U.S. states and political subdivisions $ (102 ) $ 18,886 $ — $ — $ (102 ) $ 18,886 Corporate debt securities (18,110 ) 971,361 (20,611 ) 186,262 (38,721 ) 1,157,623 Residential mortgage-backed securities (558 ) 22,806 (627 ) 10,248 (1,185 ) 33,054 Total bonds held-to-maturity (18,770 ) 1,013,053 (21,238 ) 196,510 (40,008 ) 1,209,563 Fixed maturity securities, bonds available-for-sale U.S. treasury and government (16 ) 10,640 — — (16 ) 10,640 U.S. states and political subdivisions (6,376 ) 282,141 (2 ) 122 (6,378 ) 282,263 Corporate debt securities (19,828 ) 917,215 (11,221 ) 126,584 (31,049 ) 1,043,799 Residential mortgage-backed securities (204 ) 12,420 (138 ) 3,982 (342 ) 16,402 Collateralized debt securities — 1 (3 ) 146 (3 ) 147 Other Debt Securities (55 ) 3,178 — — (55 ) 3,178 Total bonds available-for-sale (26,479 ) 1,225,595 (11,364 ) 130,834 (37,843 ) 1,356,429 Equity securities Common stock (5,195 ) 53,068 — — (5,195 ) 53,068 Preferred stock (62 ) 4,324 — — (62 ) 4,324 Total equity securities (5,257 ) 57,392 — — (5,257 ) 57,392 Total $ (50,506 ) $ 2,296,040 $ (32,602 ) $ 327,344 $ (83,108 ) $ 2,623,384 As of September 30, 2017, the securities with unrealized losses including those exceeding one year were not deemed to be other-than-temporarily impaired. American National has the ability and intent to hold those securities until a market price recovery or maturity. It is not more-likely-than-not The following table identifies the total bonds distributed by credit quality rating (in thousands, except percentages): September 30, 2017 December 31, 2016 Amortized Estimated % of Fair Amortized Estimated % of Fair Cost Fair Value Value Cost Fair Value Value AAA $ 633,694 $ 662,865 4.9 % $ 667,561 $ 691,296 5.2 % AA 1,302,818 1,357,106 9.9 1,393,137 1,440,667 10.8 A 4,643,929 4,822,438 35.3 4,538,471 4,696,909 35.3 BBB 6,095,264 6,343,348 46.4 5,758,560 5,931,112 44.6 BB and below 491,717 480,655 3.5 562,640 539,984 4.1 Total $ 13,167,422 $ 13,666,412 100.0 % $ 12,920,369 $ 13,299,968 100.0 % Equity securities by market sector distribution are shown below: September 30, 2017 December 31, 2016 Consumer goods 19.6 % 20.4 % Energy and utilities 8.9 11.1 Finance 21.9 22.1 Healthcare 13.1 12.7 Industrials 9.5 9.0 Information technology 19.1 17.1 Other 7.9 7.6 Total 100.0 % 100.0 %

Mortgage Loans

Mortgage Loans	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Mortgage Loans	Note 5 – Mortgage Loans Generally, commercial mortgage loans are secured by first liens on income-producing real estate. American National attempts to maintain a diversified portfolio by considering the location of the underlying collateral. The distribution based on carrying amount of mortgage loans by location is as follows: September 30, 2017 December 31, 2016 East North Central 14.9 % 16.2 % East South Central 3.2 3.7 Mountain 13.8 10.6 Pacific 18.6 17.6 South Atlantic 14.0 15.1 West South Central 29.1 31.0 Other 6.4 5.8 Total 100.0 % 100.0 % For the nine months ended September 30, 2017, American National foreclosed on one loan with a recorded investment of $2,285,000, and three loans with a total recorded investment of $14,926,000 were in the process of foreclosure. For the year ended December 31, 2016, American National did not foreclose on any loans, and one loan with a recorded investment of $1,940,000, was in the process of foreclosure. American National did not sell any loans during the nine months ended September 30, 2017 or during the year ended December 31, 2016. The age analysis of past due loans is shown below (in thousands): 30-59 Days 60-89 Days More Than Total September 30, 2017 Past Due Past Due 90 Days Total Current Amount Percent Industrial $ — $ — $ — $ — $ 756,086 $ 756,086 15.8 Office 10,103 6,235 8,882 25,220 1,703,700 1,728,920 36.0 Retail — — — — 749,982 749,982 15.6 Other — — — — 1,564,350 1,564,350 32.6 Total $ 10,103 $ 6,235 $ 8,882 $ 25,220 $ 4,774,118 $ 4,799,338 100.0 Allowance for loan losses (16,535 ) Total, net of allowance $ 4,782,803 December 31, 2016 Industrial $ — $ 2,300 $ — $ 2,300 $ 744,472 $ 746,772 17.1 Office — — 6,059 6,059 1,541,880 1,547,939 35.5 Retail — — — — 736,121 736,121 16.9 Other 20,179 9,280 — 29,459 1,300,245 1,329,704 30.5 Total $ 20,179 $ 11,580 $ 6,059 $ 37,818 $ 4,322,718 $ 4,360,536 100.0 Allowance for loan losses (12,490 ) Total, net of allowance $ 4,348,046 Total mortgage loans are net of unamortized purchase discounts of $59,000 and $233,000 and unamortized origination fees of $31,980,000 and $33,019,000 at September 30, 2017 and December 31, 2016, respectively. No unearned income is included in these amounts. Allowance for Credit Losses A loan is considered impaired when it is probable that all amounts due will not be collected according to the contractual terms of the loan agreement. Mortgage loans with temporary difficulties are not considered impaired when the borrower has the financial capacity to fund revenue shortfalls from the properties for the foreseeable future. Individual valuation allowances are established for impaired loans to reduce the carrying value to the fair value of the collateral. Loans not evaluated individually for collectability are segregated by property-type and location, and allowance factors are applied. These factors are developed based on our historical loss experience adjusted for the expected trend in the rate of foreclosure losses. Allowance factors are higher for loans of certain property types and in certain regions based on loss experience or a blended historical loss factor. The change in allowance for credit losses in mortgage loans is shown below (in thousands, except number of loans): Collectively Evaluated for Impairment Individually Impaired Total Number of Loans Recorded Investment Valuation Allowance Number of Loans Recorded Investment Valuation Number of Loans Recorded Investment Valuation Allowance Beginning balance, 2017 430 $ 4,358,596 $ 11,488 2 $ 1,940 $ 1,002 432 $ 4,360,536 $ 12,490 Change in allowance — — 2,222 — — 1,823 — — 4,045 Net change in recorded investment 18 417,657 — 1 4,610 — 19 422,267 — Ending balance at September 30, 2017 448 $ 4,776,253 $ 13,710 3 $ 6,550 $ 2,825 451 $ 4,782,803 $ 16,535 Troubled Debt Restructurings American National has granted concessions which are classified as troubled debt restructurings to certain mortgage loan borrowers. Concessions are generally one of, or a combination of, a delay in payment of principal or interest, a reduction of the contractual interest rate or an extension of the maturity date. American National considers the amount, timing and extent of concessions in determining any impairment or changes in the specific allowance for loan losses recorded in connection with a troubled debt restructuring. The carrying value after specific allowance, before and after modification in a troubled debt restructuring, may not change significantly, or may increase if the expected recovery is higher than the pre-modification Troubled debt restructuring mortgage loan information is as follows (in thousands, except number of loans): Nine months ended September 30, 2017 2016 Number of loans Recorded investment pre- modification Recorded investment post modification Number of loans Recorded investment pre- modification Recorded investment post modification Retail — $ — $ — 2 $ 10,189 $ 10,189 Offices 1 10,103 10,103 — — — Other (hotel/motel) 5 24,801 24,801 — — — Total 6 $ 34,904 $ 34,904 2 $ 10,189 $ 10,189 There are $7,739,000 of commitments to lend additional funds to debtors whose loans have been modified in troubled debt restructuring, and there have been no defaults on modified loans during the periods presented.

Real Estate and Other Investmen

Real Estate and Other Investments	9 Months Ended
	Sep. 30, 2017
Real Estate [Abstract]
Real Estate and Other Investments	Note 6 – Real Estate and Other Investments Investment real estate by property-type and geographic distribution are as follows: September 30, 2017 December 31, 2016 Industrial 5.9 % 9.2 % Office 39.9 37.8 Retail 38.5 37.2 Other 15.7 15.8 Total 100.0 % 100.0 % September 30, 2017 December 31, 2016 East North Central 6.2 % 8.8 % East South Central 3.5 3.4 Mountain 12.8 12.0 Pacific 7.7 6.1 South Atlantic 13.4 13.0 West South Central 51.9 52.2 Other 4.5 4.5 Total 100.0 % 100.0 % American National regularly invests in real estate partnerships and joint ventures. American National frequently participates in the design of these entities with the sponsor, but in most cases, its involvement is limited to financing. Through analysis performed by American National, some of these partnerships and joint ventures have been determined to be variable interest entities (“VIEs”). In certain instances, in addition to an economic interest in the entity, American National holds the power to direct the most significant activities of the entity and is deemed the primary beneficiary or consolidator of the entity. The assets of the consolidated VIEs are restricted and must first be used to settle their liabilities. Creditors or beneficial interest holders of these VIEs have no recourse to the general credit of American National, as American National’s obligation is limited to the amount of its committed investment. American National has not provided financial or other support to the VIEs in the form of liquidity arrangements, guarantees, or other commitments to third parties that may affect the fair value or risk of its variable interest in the VIEs in 2017 or 2016. The assets and liabilities relating to the VIEs included in the consolidated financial statements are as follows (in thousands): September 30, 2017 December 31, 2016 Investment real estate $ 153,793 $ 173,816 Short-term investments 1,000 1 Cash and cash equivalents 4,146 6,099 Other receivables 4,645 6,456 Other assets 11,652 8,820 Total assets of consolidated VIEs $ 175,236 $ 195,192 Notes payable $ 138,165 $ 136,080 Other liabilities 5,103 10,037 Total liabilities of consolidated VIEs $ 143,268 $ 146,117 The notes payable in the consolidated statements of financial position pertain to the borrowings of the consolidated VIEs. The liability of American National relating to notes payable of the consolidated VIEs is limited to the amount of its direct or indirect investment in the respective ventures, which totaled $28,552,000 and $31,795,000 at September 30, 2017 and December 31, 2016, respectively. The total long-term notes payable of the consolidated VIE’s consists of the following (in thousands): Interest rate Maturity September 30, 2017 December 31, 2016 Prime 2018 $ 2 $ 1,267 LIBOR 2020 9,700 7,318 90 day LIBOR + 2.5% 2021 40,123 37,074 4% fixed 2022 88,340 90,421 Total $ 138,165 $ 136,080 For other VIEs in which American National is a partner, it is not the primary beneficiary, and these entities are not consolidated, as the major decisions that most significantly impact the economic activities of the VIE require unanimous consent of all partners. The carrying amount and maximum exposure to loss relating to unconsolidated VIEs follows (in thousands): September 30, 2017 December 31, 2016 Maximum Maximum Carrying Exposure Carrying Exposure Amount to Loss Amount to Loss Investment in unconsolidated affiliates $ 341,802 $ 341,802 $ 323,933 $ 323,933 Mortgage loans 603,655 603,655 481,799 481,799 Accrued investment income 2,166 2,166 1,919 1,919 As of September 30, 2017, no real estate investments were classified as held for sale.

Derivative Instruments

Derivative Instruments	9 Months Ended
	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Note 7 – Derivative Instruments American National purchases over-the-counter September 30, 2017 December 31, 2016 Derivatives Not Designated as Hedging Instruments Location in the Consolidated Statements of Financial Position Number of Instruments Notional Amounts Estimated Fair Value Number of Instruments Notional Amounts Estimated Fair Value Equity-indexed options Other invested assets 465 $ 1,739,400 $ 189,674 442 $ 1,414,100 $ 156,479 Equity-indexed embedded derivative Policyholders’ 72,684 1,642,300 439,246 62,481 1,289,800 314,330 Derivatives Not Designated as Hedging Instruments Location in the Consolidated Statements of Operations Gains (Losses) Recognized in Income on Derivatives Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Equity-indexed options Net investment income $ 20,992 $ 15,040 $ 57,555 $ 17,190 Equity-indexed embedded derivative Interest credited to policyholders’ account balances (25,637 ) (15,054 ) (69,741 ) (21,227 ) The Company’s use of derivative instruments exposes it to credit risk in the event of non-performance non-performance Information regarding the Company’s exposure to credit loss on the options it holds is presented below (in thousands): September 30, 2017 Counterparty Moody/S&P Rating Options Fair Value Collateral Held Collateral Amounts used to Excess and Restricted Collateral Exposure Net of Collateral Barclays Baa2/BBB $ 47,205 $ 47,623 $ 47,205 $ 418 $ — Goldman-Sachs A3/BBB+ 820 780 780 — 40 ING Baa1/A- 26,098 23,230 23,230 — 2,868 JP Morgan A3/A- 185 — — — 185 Morgan Stanley A3/BBB+ 15,930 16,376 15,930 446 — NATIXIS* A2/A 29,182 28,910 — 28,910 29,182 SunTrust Baa1/BBB+ 32,971 32,010 32,010 — 961 Wells Fargo A2/A 37,283 36,090 36,090 — 1,193 Total $ 189,674 $ 185,019 $ 155,245 $ 29,774 $ 34,429 December 31, 2016 Counterparty Moody/S&P Rating Options Fair Value Collateral Held Collateral Amounts used to Offset Exposure Excess and Restricted Collateral Exposure Net of Collateral Barclays Baa2/BBB $ 33,839 $ 35,063 $ 33,839 $ 1,224 $ — Citigroup Baa1/BBB+ 2,249 — — — 2,249 Goldman-Sachs A3/BBB+ 1,452 1,400 1,400 — 52 ING Baa1/A- 29,609 26,430 26,430 — 3,179 JP Morgan A3/A- 163 — — — 163 Morgan Stanley A3/BBB+ 17,864 17,680 17,680 — 184 NATIXIS* A2/A 24,804 26,620 — 26,620 24,804 SunTrust Baa1/BBB+ 19,559 19,960 19,559 401 — Wells Fargo A2/A 26,940 26,540 26,540 — 400 Total $ 156,479 $ 153,693 $ 125,448 $ 28,245 $ 31,031 * Collateral Restrictions

Net Investment Income and Reali

Net Investment Income and Realized Investment Gains (Losses)	9 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Net Investment Income and Realized Investment Gains (Losses)	Note 8 – Net Investment Income and Realized Investment Gains (Losses) Net investment income is shown below (in thousands): Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Bonds $ 134,990 $ 137,322 $ 404,793 $ 416,301 Equity securities 9,688 9,094 28,694 28,421 Mortgage loans 54,913 61,277 179,933 158,593 Real estate 8,233 2,395 6,484 950 Options 20,992 15,040 57,555 17,190 Other invested assets 12,389 2,656 26,867 13,093 Total $ 241,205 $ 227,784 $ 704,326 $ 634,548 Realized investment gains (losses) are shown below (in thousands): Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Bonds $ 6,116 $ 8,412 $ 16,184 $ 13,005 Equity securities 26,842 17,599 41,937 28,529 Mortgage loans (664 ) (883 ) (5,369 ) 176 Real estate (161 ) (2,928 ) 4,838 (2,655 ) Other invested assets 1,796 (19 ) 1,748 (846 ) Total $ 33,929 $ 22,181 $ 59,338 $ 38,209 Other-than-temporary impairment losses are shown below (in thousands): Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Bonds $ (47 ) $ (94 ) $ (6,047 ) $ (94 ) Equity securities (3,438 ) (5,820 ) (5,690 ) (12,847 ) Total $ (3,485 ) $ (5,914 ) $ (11,737 ) $ (12,941 )

Fair Value of Financial Instrum

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Note 9 – Fair Value of Financial Instruments The carrying amount and fair value of financial instruments are shown below (in thousands): September 30, 2017 December 31, 2016 Carrying Amount Fair Value Carrying Amount Fair Value Financial assets Fixed maturity securities, bonds held-to-maturity $ 7,342,224 $ 7,621,182 $ 7,251,385 $ 7,496,692 Fixed maturity securities, bonds available-for-sale 6,045,230 6,045,230 5,803,276 5,803,276 Equity securities 1,702,303 1,702,303 1,541,676 1,541,676 Equity-indexed options 189,674 189,674 156,479 156,479 Mortgage loans on real estate, net of allowance 4,782,803 4,866,171 4,348,046 4,435,530 Policy loans 376,850 376,850 384,376 384,376 Short-term investments 561,773 561,773 192,226 192,226 Separate account assets 933,811 933,811 941,612 941,612 Total financial assets $ 21,934,668 $ 22,296,994 $ 20,619,076 $ 20,951,867 Financial liabilities Investment contracts $ 8,916,612 $ 8,916,612 $ 8,785,412 $ 8,785,412 Embedded derivative liability for equity-indexed contracts 439,246 439,246 314,330 314,330 Notes payable 138,165 138,165 136,080 136,080 Separate account liabilities 933,811 933,811 941,612 941,612 Total financial liabilities $ 10,427,834 $ 10,427,834 $ 10,177,434 $ 10,177,434 Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability. A fair value hierarchy is used to determine fair value based on a hypothetical transaction at the measurement date from the perspective of a market participant. American National has evaluated the types of securities in its investment portfolio to determine an appropriate hierarchy level based upon trading activity and the observability of market inputs. The classification of assets or liabilities within the fair value hierarchy is based on the lowest level of significant input to its valuation. The input levels are defined as follows: Level 1 Unadjusted quoted prices in active markets for identical assets or liabilities. Level 2 Quoted prices in markets that are not active or inputs that are observable directly or indirectly. Level 2 inputs include quoted prices for similar assets or liabilities other than quoted prices in Level 1; quoted prices in markets that are not active; or other inputs that are observable or can be derived principally from or corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3 Unobservable inputs that are supported by little or no market activity and are significant to the fair value of the assets or liabilities. Unobservable inputs reflect American National’s own assumptions about the assumptions that market participants would use in pricing the asset or liability. Level 3 assets and liabilities include financial instruments whose values are determined using pricing models and third-party evaluation, as well as instruments for which the determination of fair value requires significant management judgment or estimation. Fixed Maturity Securities and Equity Options The pricing service utilizes market quotations for fixed maturity securities that have quoted prices in active markets. Since fixed maturity securities generally do not trade on a daily basis, the pricing service prepares estimates of fair value measurements for these securities using its proprietary pricing applications, which include available relevant market information, benchmark curves, benchmarking of like securities, sector groupings and matrix pricing. Additionally, an option adjusted spread model is used to develop prepayment and interest rate scenarios. The pricing service evaluates each asset class based on relevant market information, credit information, perceived market movements and sector news. The market inputs utilized in the pricing evaluation, listed in the approximate order of priority, include: benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided American National has reviewed the inputs and methodology used and the techniques applied by the pricing service to produce quotes that represent the fair value of a specific security. The review confirms that the pricing service is utilizing information from observable transactions or a technique that represents a market participant’s assumptions. American National does not adjust quotes received from the pricing service. The pricing service utilized by American National has indicated that they will only produce an estimate of fair value if there is objectively verifiable information available. American National holds a small amount of private placement debt and fixed maturity securities that have characteristics that make them unsuitable for matrix pricing. For these securities, a quote from an independent broker (typically a market maker) is obtained. Due to the disclaimers on the quotes that indicate that the price is indicative only, American National includes these fair value estimates in Level 3. For securities priced using a quote from an independent broker, such as the equity-indexed options and certain fixed maturity securities, American National uses a market-based fair value analysis to validate the reasonableness of prices received. Price variances above a certain threshold are analyzed further to determine if any pricing issue exists. This analysis is performed quarterly. Equity Securities Mortgage Loans Embedded Derivative • Lapse rate assumptions are determined by company experience. Lapse rates are generally assumed to be lower during a contract’s surrender charge period and then higher once the surrender charge period has ended. Decreases to the assumed lapse rates generally increase the fair value of the liability as more policyholders persist to collect the crediting interest pertaining to the indexed product. Increases to the lapse rate assumption will have the inverse effect decreasing the fair value. • Mortality rate assumptions vary by age and by gender based on company and industry experience. Decreases to the assumed mortality rates increase the fair value of the liabilities as more policyholders earn crediting interest. Increases to the assumed mortality rates decrease the fair value as higher decrements reduce the potential for future interest credits. • Equity volatility assumptions begin with current market volatilities and grow to long-term values. Increases to the assumed volatility will increase the fair value of liabilities, as future projections will produce higher increases in the linked index. At September 30, 2017 and December 31, 2016, the one year implied volatility used to estimate embedded derivative value was 13.5% and 16.5%, respectively. Fair values of indexed life and annuity liabilities are calculated using the discounted cash flow technique. Shown below are the significant unobservable inputs used to calculate the Level 3 fair value of the embedded derivatives within policyholder contract deposits (in millions, except range percentages): Fair Value September 30, 2017 December 31, 2016 Unobservable Input Range Indexed Annuities $ 428.0 $ 306.5 Lapse Rate 1%-66% Mortality Multiplier 90%-100% Equity Volatility 12%-40% Indexed Life 11.2 7.8 Lapse Rate — Mortality Multiplier — Equity Volatility 12%-40% Other Financial Instruments Policy loans—The carrying value of policy loans is the outstanding balance plus any accrued interest. Due to the collateralized nature of policy loans such that they cannot be separated from the policy contracts, the unpredictable timing of repayments and the fact that settlement is at outstanding value, American National believes the carrying value of policy loans approximates fair value. Investment contracts —The carrying value of investment contracts is equivalent to the accrued account balance. The accrued account balance consists of deposits, net of withdrawals, plus or minus interest credited, fees and charges assessed and other adjustments. American National believes that the carrying value of investment contracts approximates fair value because the majority of these contracts’ interest rates reset to current rates offered at anniversary. Notes payable— Notes payable are carried at outstanding principal balance. The carrying value of the notes payable approximates fair value because the underlying interest rates approximate market rates at the balance sheet date. Quantitative Disclosures The fair value hierarchy measurements of the financial instruments are shown below (in thousands): Fair Value Measurement as of September 30, 2017 Total Level 1 Level 2 Level 3 Financial assets Fixed maturity securities, bonds held-to-maturity U.S. states and political subdivisions $ 286,034 $ — $ 286,034 $ — Foreign governments 4,680 — 4,680 — Corporate debt securities 7,084,488 — 7,057,070 27,418 Residential mortgage-backed securities 243,154 — 242,279 875 Collateralized debt securities 975 — 975 — Other debt securities 1,851 — — 1,851 Total bonds held-to-maturity 7,621,182 — 7,591,038 30,144 Fixed maturity securities, bonds available-for-sale U.S. treasury and government 28,716 — 28,716 — U.S. states and political subdivisions 924,545 — 922,090 2,455 Foreign governments 6,506 — 6,506 — Corporate debt securities 5,054,596 — 5,054,209 387 Residential mortgage-backed securities 15,023 — 15,023 — Collateralized debt securities 3,955 — 3,955 — Other debt securities 11,889 — 11,889 — Total bonds available-for-sale 6,045,230 — 6,042,388 2,842 Equity securities Common stock 1,678,528 1,678,400 — 128 Preferred stock 23,775 23,775 — — Total equity securities 1,702,303 1,702,175 — 128 Options 189,674 — — 189,674 Mortgage loans on real estate 4,866,171 — 4,866,171 — Policy loans 376,850 — — 376,850 Short-term investments 561,773 — 561,773 — Separate account assets 933,811 — 933,811 — Total financial assets $ 22,296,994 $ 1,702,175 $ 19,995,181 $ 599,638 Financial liabilities Investment contracts $ 8,916,612 $ — $ — $ 8,916,612 Embedded derivative liability for equity-indexed contracts 439,246 — — 439,246 Notes payable 138,165 — — 138,165 Separate account liabilities 933,811 — 933,811 — Total financial liabilities $ 10,427,834 $ — $ 933,811 $ 9,494,023 Fair Value Measurement as of December 31, 2016 Total Level 1 Level 2 Level 3 Financial assets Fixed maturity securities, bonds held-to-maturity U.S. states and political subdivisions $ 319,082 $ — $ 319,082 $ — Foreign governments 4,716 — 4,716 — Corporate debt securities 6,925,978 — 6,875,015 50,963 Residential mortgage-backed securities 242,685 — 241,779 906 Collateralized debt securities 1,354 — — 1,354 Other debt securities 2,877 — — 2,877 Total bonds held-to-maturity 7,496,692 — 7,440,592 56,100 Fixed maturity securities, bonds available-for-sale U.S. treasury and government 25,640 — 25,640 — U.S. states and political subdivisions 960,223 — 957,748 2,475 Foreign governments 6,567 — 6,567 — Corporate debt securities 4,780,763 — 4,773,516 7,247 Residential mortgage-backed securities 20,513 — 17,909 2,604 Collateralized debt securities 6,392 — 4,454 1,938 Other debt securities 3,178 — 3,178 — Total bonds available-for-sale 5,803,276 — 5,789,012 14,264 Equity securities Common stock 1,518,515 1,518,515 — — Preferred stock 23,161 23,161 — — Total equity securities 1,541,676 1,541,676 — — Options 156,479 — — 156,479 Mortgage loans on real estate 4,435,530 — 4,435,530 — Policy loans 384,376 — — 384,376 Short-term investments 192,226 — 192,226 — Separate account assets 941,612 — 941,612 — Total financial assets $ 20,951,867 $ 1,541,676 $ 18,798,972 $ 611,219 Financial liabilities Investment contracts $ 8,785,412 $ — $ — $ 8,785,412 Embedded derivative liability for equity-indexed contracts 314,330 — — 314,330 Notes payable 136,080 — — 136,080 Separate account liabilities 941,612 — 941,612 — Total financial liabilities $ 10,177,434 $ — $ 941,612 $ 9,235,822 For financial instruments measured at fair value on a recurring basis using Level 3 inputs during the period, a reconciliation of the beginning and ending balances is shown below (in thousands): Level 3 Three months ended September 30, Nine months ended September 30, Assets Liability Assets Liability Investment Equity-Indexed Embedded Investment Equity-Indexed Embedded Securities Options Derivative Securities Options Derivative Beginning balance, 2017 $ 15,852 $ 172,377 $ 390,189 $ 14,264 $ 156,479 $ 314,330 Total realized and unrealized investment losses included in other comprehensive income (3,703 ) — — (8,065 ) — — Net fair value change included in realized gains (losses) — — — — — — Net gain for derivatives included in net investment income — 20,671 — — 57,004 — Net change included in interest credited — — 25,637 — — 69,741 Purchases, sales and settlements or maturities Purchases — 12,047 — — 33,062 — Sales (5,297 ) — — (8,836 ) (12,837 ) — Settlements or maturities (4,010 ) (15,421 ) — (7,020 ) (44,034 ) — Premiums less benefits — — 23,420 — — 55,175 Carry value transfers in — — — 15,000 — — Gross transfers into Level 3 — — — 382 — — Gross transfers out of Level 3 — — — (2,883 ) — — Ending balance at September 30, 2017 $ 2,842 $ 189,674 $ 439,246 $ 2,842 $ 189,674 $ 439,246 Beginning balance, 2016 $ 21,666 $ 134,575 $ 278,570 $ 20,130 $ 123,007 $ 242,412 Total realized and unrealized investment gains included in other comprehensive income 128 — — 639 — — Net fair value change included in realized losses (2 ) — — (1 ) — — Net gain for derivatives included in net investment income — 14,716 — — 16,866 — Net change included in interest credited — — 15,054 — — 21,227 Purchases, sales and settlements or maturities Purchases — 7,786 — — 20,257 — Sales — — — — — — Settlements or maturities — (11,627 ) — (389 ) (14,680 ) — Premiums less benefits — — 4,875 — — 34,860 Gross transfers into Level 3 — — — 1,413 — — Gross transfers out of Level 3 (504 ) — — (504 ) — — Ending balance at September 30, 2016 $ 21,288 $ 145,450 $ 298,499 $ 21,288 $ 145,450 $ 298,499 Within the net gain for derivatives included in net investment income were unrealized gains of $26,489,000, and $34,146,000 relating to assets still held at September 30, 2017, and 2016, respectively. There were no transfers between Level 1 and Level 2 fair value hierarchies during the periods presented. The transfers into Level 3 during the nine months ended September 30, 2017 and 2016 were the result of existing securities no longer being priced by the third-party pricing service at the end of the period. Unless information is obtained from the brokers that indicate observable inputs were used in their pricing, there are not enough observable inputs to enable American National to classify the securities priced by the brokers as other than Level 3. American National’s valuation of these securities involves judgment regarding assumptions market participants would use including quotes from independent brokers. The inputs used by the brokers include recent transactions in the security, similar bonds with same name, ratings, maturity and structure, external dealer quotes in the security, Bloomberg evaluated pricing and prior months pricing. None of them are observable to American National as of September 30, 2017. The transfers out of Level 3 during the nine months ended September 30, 2017 and 2016 were securities being priced by the third-party service at the end of the period, using inputs that are observable or derived from market data, which resulted in classification of these assets as Level 2.

Deferred Policy Acquisition Cos

Deferred Policy Acquisition Costs	9 Months Ended
	Sep. 30, 2017
Insurance [Abstract]
Deferred Policy Acquisition Costs	Note 10 – Deferred Policy Acquisition Costs Deferred policy acquisition costs are shown below (in thousands): Life Annuity Accident & Health Property & Casualty Total Beginning balance, 2017 $ 745,840 $ 394,208 $ 40,620 $ 113,775 $ 1,294,443 Additions 92,752 77,414 8,435 215,626 394,227 Amortization (48,702 ) (54,438 ) (11,352 ) (210,328 ) (324,820 ) Effect of change in unrealized gains on available-for-sale (5,558 ) (5,993 ) — — (11,551 ) Net change 38,492 16,983 (2,917 ) 5,298 57,856 Ending balance at September 30, 2017 $ 784,332 $ 411,191 $ 37,703 $ 119,073 $ 1,352,299 Commissions comprise the majority of the additions to deferred policy acquisition costs.

Liability for Unpaid Claims and

Liability for Unpaid Claims and Claim Adjustment Expenses	9 Months Ended
	Sep. 30, 2017
Insurance [Abstract]
Liability for Unpaid Claims and Claim Adjustment Expenses	Note 11 – Liability for Unpaid Claims and Claim Adjustment Expenses The liability for unpaid claims and claim adjustment expenses (“claims”) for accident and health, and property and casualty insurance is included in “Policy and contract claims” in the consolidated statements of financial position and is the amount estimated for incurred but not reported (“IBNR”) claims and claims that have been reported but not settled. Liability for unpaid claims are estimated based upon American National’s historical experience and actuarial assumptions that consider the effects of current developments, anticipated trends and risk management programs, less anticipated salvage and subrogation. The effects of the changes are included in the consolidated results of operations in the period in which the changes occur. The time value of money is not taken into account for the purposes of calculating the liability for unpaid claims. There have been no significant changes in methodologies or assumptions used to calculate the liability for unpaid claims and claim adjustment expenses. Information regarding the liability for unpaid claims is shown below (in thousands): Nine months ended September 30, 2017 2016 Unpaid claims balance, beginning $ 1,140,723 $ 1,104,302 Less reinsurance recoverables 216,903 217,337 Net beginning balance 923,820 886,965 Incurred related to Current 847,289 804,177 Prior years (61,284 ) (26,632 ) Total incurred claims 786,005 777,545 Paid claims related to Current 483,111 472,413 Prior years 259,478 271,701 Total paid claims 742,589 744,114 Net balance 967,236 920,396 Plus reinsurance recoverables 232,187 247,998 Unpaid claims balance, ending $ 1,199,423 $ 1,168,394 The net and gross reserve calculations have shown favorable development as a result of favorable loss emergence compared to what was implied by the loss development patterns used in the original estimation of losses in prior years. Estimates for ultimate incurred claims attributable to insured events of prior years decreased by approximately $61,284,000 during the first nine months of 2017 and decreased by approximately $26,632,000 during the first nine months of 2016. This was a reflection of lower-than-anticipated losses in the first nine months of 2017 related to accident years prior to 2017 in the auto, business owner and commercial package policy lines of business. For short-duration health insurance claims, the total of IBNR plus expected development on reported claims included in the liability for unpaid claims and claim adjustment expenses at September 30, 2017 was $29,887,000.

Federal Income Taxes

Federal Income Taxes	9 Months Ended
	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Federal Income Taxes	Note 12 – Federal Income Taxes A reconciliation of the effective tax rate to the statutory federal tax rate is shown below (in thousands, except percentages): Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Amount Rate Amount Rate Amount Rate Amount Rate Income tax on pre-tax $ 39,534 35.0 % $ 29,488 35.0 % $ 74,001 35.0 % $ 52,771 35.0 % Tax-exempt (1,737 ) (1.5 ) (1,980 ) (2.4 ) (5,338 ) (2.5 ) (5,926 ) (3.9 ) Deferred tax change 29 — — — (1,202 ) (0.6 ) (10,508 ) (7.0 ) Dividend exclusion (2,078 ) (1.8 ) (1,917 ) (2.3 ) (6,242 ) (3.0 ) (6,143 ) (4.1 ) Miscellaneous tax credits, net (2,268 ) (2.0 ) (2,430 ) (2.9 ) (7,067 ) (3.3 ) (7,546 ) (5.0 ) Low income housing tax credit expense 1,254 1.1 1,294 1.5 3,763 1.8 3,883 2.6 Other items, net 1,701 1.5 (1,907 ) (2.3 ) 2,023 0.9 (765 ) (0.5 ) Provision for federal income tax before interest expense 36,435 32.3 22,548 26.6 59,938 28.3 25,766 17.1 Interest expense (84 ) (0.1 ) 42 — — — 2,644 1.8 Total $ 36,351 32.2 % $ 22,590 26.6 % $ 59,938 28.3 % $ 28,410 18.9 % American National made income tax payments of $8,466,000 and $35,458,000 during the nine months ended September 30, 2017 and 2016, respectively. Management believes sufficient taxable income will be achieved over time to utilize the deferred tax assets in the consolidated federal tax return; therefore, no valuation allowance was recorded as of September 30, 2017 and 2016. There are no net operating or capital loss carryforwards that will expire by December 31, 2017. American National’s federal income tax returns for years 2013 to 2016 and years 2005 to 2009 are in process of being closed by the Internal Revenue Service. We have received $8.0 million in refunds related to these years. In the opinion of management, all prior year deficiencies have been paid or adequate provisions have been made for any tax deficiencies that may be upheld. No provision for penalties or interest were established during 2017 relating to a dispute with the Internal Revenue Service. Management does not believe there are any uncertain tax benefits that could be recognized within the next twelve months that would decrease American National’s effective tax rate.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Accumulated Other Comprehensive Income	Note 13 – Accumulated Other Comprehensive Income The components of and changes in the accumulated other comprehensive income (“AOCI”), and the related tax effects, are shown below (in thousands): Net Unrealized on Securities Defined Foreign AOCI Beginning balance, 2017 $ 547,138 $ (88,603 ) $ (2,636 ) $ 455,899 Amounts reclassified from AOCI (net of tax benefit $12,657 and expense $4,995) (23,507 ) 9,276 — (14,231 ) Unrealized holding gains arising during the period (net of tax expense $87,786) 163,031 — — 163,031 Unrealized adjustment to DAC (net of tax benefit $4,330) (7,221 ) — — (7,221 ) Unrealized gains on investments attributable to participating policyholders’ interest (net of tax benefit $3,199) (5,941 ) — — (5,941 ) Foreign currency adjustment (net of tax expense $374) — — 694 694 Ending balance at September 30, 2017 $ 673,500 $ (79,327 ) $ (1,942 ) $ 592,231 Beginning balance, 2016 $ 453,434 $ (97,889 ) $ (2,925 ) $ 352,620 Amounts reclassified from AOCI (net of tax benefit $7,078 and expense $3,438) (13,145 ) 6,384 — (6,761 ) Unrealized holding gains arising during the period (net of tax expense $120,365) 223,535 — — 223,535 Unrealized adjustment to DAC (net of tax benefit $24,859) (45,567 ) — — (45,567 ) Unrealized gains on investments attributable to participating policyholders’ interest (net of tax benefit $4,715) (8,757 ) — — (8,757 ) Foreign currency adjustment (net of tax benefit $361) — — (671 ) (671 ) Ending balance at September 30, 2016 $ 609,500 $ (91,505 ) $ (3,596 ) $ 514,399

Stockholders' Equity and Noncon

Stockholders' Equity and Noncontrolling Interests	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Stockholders' Equity and Noncontrolling Interests	Note 14 – Stockholders’ Equity and Noncontrolling Interests American National has one class of common stock with a par value of $1.00 per share and 50,000,000 authorized shares. The amounts outstanding at the dates indicated are shown below: September 30, 2017 December 31, 2016 Common stock Shares issued 30,832,449 30,832,449 Treasury shares (3,900,565 ) (3,917,933 ) Outstanding shares 26,931,884 26,914,516 Restricted shares (74,000 ) (76,000 ) Unrestricted outstanding shares 26,857,884 26,838,516 Stock-based compensation American National has a stock-based compensation plan, which allows for grants of Non-Qualified SAR, RS and RSU information for the periods indicated are shown below: SAR RS Shares RS Units Shares Weighted-Average Fair Value Shares Weighted-Average Fair Value Units Weighted-Average Fair Value Outstanding at December 31, 2016 6,153 $ 113.36 76,000 $ 110.73 100,445 $ 105.97 Granted — — — — 16,500 117.89 Exercised — — (2,000 ) 130.52 (62,079 ) 108.91 Forfeited — — — — (2,069 ) 104.17 Expired (3,234 ) 118.37 — — — — Outstanding at September 30, 2017 2,919 $ 107.81 74,000 $ 110.19 52,797 $ 106.26 SAR RS Shares RS Units Weighted-average contractual remaining life (in years) 0.77 3.01 0.90 Exercisable shares 2,919 N/A N/A Weighted-average exercise price $ 107.81 $ 110.19 $ 106.26 Weighted-average exercise price exercisable shares 107.81 N/A N/A Compensation expense (credit) Three months ended September 30, 2017 $ 5,000 $ 206,000 $ 565,000 Three months ended September 30, 2016 98,000 212,000 1,297,000 Nine months ended September 30, 2017 (44,000 ) 618,000 2,214,000 Nine months ended September 30, 2016 135,000 631,000 5,744,000 Fair value of liability award September 30, 2017 $ 34,000 N/A $ 6,479,000 December 31, 2016 (restated) 213,000 N/A 13,197,000 The SARs give the holder the right to cash compensation based on the difference between the stock price on the grant date and the stock price on the exercise date. The SARs vest at a rate of 20% per year for five years and expire five years after vesting. RS awards entitle the participant to full dividend and voting rights. Each RS share awarded has the value of one share of restricted stock and vests 10 years from the grant date. Unvested shares are restricted as to disposition, and are subject to forfeiture under certain circumstances. Compensation expense is recognized over the vesting period. The restrictions on these awards lapse after 10 years and most of these awards feature a graded vesting schedule in the case of the retirement, death or disability of an award holder. Restricted stock awards for 350,334 shares have been granted at an exercise price of zero, of which 74,000 shares are unvested. RSU awards allow the recipient of the awards to settle the vested RSUs in either shares of American National’s common stock, cash or a combination of both. RSUs granted vest after a one-year Earnings per share Basic earnings per share were calculated using a weighted average number of shares outstanding. Diluted earnings per share include RS and RSU award shares. Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Weighted average shares outstanding 26,894,538 26,908,032 26,895,952 26,908,619 Incremental shares from RS awards and RSUs 64,126 59,299 63,275 57,768 Total shares for diluted calculations 26,958,664 26,967,331 26,959,227 26,966,387 Net income attributable to American National (in thousands) $ 73,269 $ 59,289 $ 149,068 $ 121,230 Basic earnings per share $ 2.72 $ 2.20 $ 5.54 $ 4.51 Diluted earnings per share 2.72 2.20 5.53 4.50 Statutory Capital and Surplus Risk Based Capital (“RBC”) is a measure insurance regulators use to evaluate the capital adequacy of American National Insurance Company and its insurance subsidiaries. RBC is calculated using formulas applied to certain financial balances and activities that consider, among other things, investment risks related to the type and quality of investments, insurance risks associated with products and liabilities, interest rate risks and general business risks. Insurance companies that do not maintain capital and surplus at a level at least 200% of the authorized control level RBC are required to take certain actions. At September 30, 2017 and December 31, 2016, American National Insurance Company’s statutory capital and surplus was $3,070,652,000 and $2,985,909,000, respectively. American National Insurance Company and each of its insurance subsidiaries had statutory capital and surplus at September 30, 2017 and December 31, 2016, substantially above 200% of the authorized control level. American National and its insurance subsidiaries prepare statutory-basis financial statements in accordance with statutory accounting practices prescribed or permitted by the insurance department of the state of domicile, which include certain components of the National Association of Insurance Commissioners’ Codification of Statutory Accounting Principles (“NAIC Codification”). NAIC Codification is intended to standardize regulatory accounting and reporting to state insurance departments. However, statutory accounting practices continue to be established by individual state laws and permitted practices. Modifications by the various state insurance departments may impact the statutory capital and surplus of American National Insurance Company and its insurance subsidiaries. Statutory accounting differs from GAAP primarily by charging policy acquisition costs to expense as incurred, establishing future policy benefit liabilities using different actuarial assumptions, and valuing securities on a different basis. In addition, certain assets are not admitted under statutory accounting principles and are charged directly to surplus. One of American National’s insurance subsidiaries has been granted a permitted practice from the Missouri Department of Insurance to record as the valuation of its investment in a wholly-owned subsidiary that is the attorney-in-fact The statutory capital and surplus and net income of our life and property and casualty insurance entities in accordance with statutory accounting practices are shown below (in thousands): September 30, 2017 December 31, 2016 Statutory capital and surplus Life insurance entities $ 1,978,684 $ 1,921,171 Property and casualty insurance entities 1,102,644 1,074,525 Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Statutory net income Life insurance entities $ 9,674 $ 22,226 $ 28,016 $ 45,335 Property and casualty insurance entities 20,096 11,417 21,268 14,674 Dividends American National Insurance Company’s payment of dividends to stockholders is restricted by insurance law. The restrictions require life insurance companies to maintain minimum amounts of capital and surplus, and in the absence of special approval, limit the payment of dividends to the greater of the prior year’s statutory net income from operations, or 10% of prior year statutory surplus. American National Insurance Company is permitted without prior approval of the Texas Department of Insurance to pay total dividends of $298,591,000 during 2017. Similar restrictions on amounts that can transfer in the form of dividends, loans, or advances to American National Insurance Company apply to its insurance subsidiaries. Noncontrolling interests American National County Mutual Insurance Company (“County Mutual”) is a mutual insurance company owned by its policyholders. American National has a management agreement that effectively gives it control of County Mutual. As a result, County Mutual is included in the consolidated financial statements of American National. Policyholder interests in the financial position of County Mutual are reflected as noncontrolling interest of $6,750,000 at September 30, 2017 and December 31, 2016. American National Insurance Company and its subsidiaries exercise significant control or ownership of various joint ventures, resulting in their consolidation into American National’s consolidated financial statements. The interests of the other partners in the consolidated joint ventures are shown as noncontrolling interests of $2,724,000 and $2,567,000 at September 30, 2017 and December 31, 2016, respectively.

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Segment Information	Note 15 – Segment Information Management organizes the business into five operating segments: • Life—markets whole, term, universal, indexed and variable life insurance on a national basis primarily through career, multiple-line, and independent agents as well as direct marketing channels. • Annuity—offers fixed, indexed, and variable annuity products. These products are primarily sold through independent agents, brokers, and financial institutions, along with multiple-line and career agents. • Health—primary lines of business are Medicare supplement, stop loss, other supplemental health products and credit disability insurance. Health products are typically distributed through independent agents and managing general underwriters. • Property and Casualty—writes personal, agricultural and targeted commercial coverages and credit-related property insurance. These products are primarily sold through multiple-line and independent agents. • Corporate and Other—consists of net investment income from investments not allocated to the insurance segments and revenues from non-insurance The accounting policies of the segments are the same as those described in Note 2 to American National’s 2016 annual report on Form 10-K. • Recurring income from bonds and mortgage loans is allocated based on the assets allocated to each line of business at the average yield available from these assets. • Net investment income from all other assets is allocated to the insurance segments in accordance with the amount of capital allocated to each segment, with the remainder recorded in the Corporate and Other business segment. • Expenses are allocated based upon various factors, including premium and commission ratios of the operating segments. The following summarizes the results of operations measured as the income before federal income taxes, and equity in earnings of unconsolidated affiliates by operating segments (in thousands): Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Life $ 15,647 $ 9,547 $ 30,950 $ 22,832 Annuity 15,014 13,567 56,638 49,001 Health 3,714 (6,487 ) 9,263 (2,702 ) Property and Casualty 15,431 663 8,587 2,878 Corporate and Other 40,761 30,432 61,793 39,501 Total $ 90,567 $ 47,722 $ 167,231 $ 111,510

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 16 – Commitments and Contingencies Commitments American National had aggregate commitments at September 30, 2017, to purchase, expand or improve real estate, to fund fixed interest rate mortgage loans, and to purchase other invested assets of $827,681,000 of which $250,638,000 is expected to be funded in 2017 with the remainder funded in 2018 and beyond. American National has a $100,000,000 short-term variable rate borrowing facility containing a $55,000,000 sub-feature Guarantees American National has guaranteed bank loans for customers of a third-party marketing operation. The bank loans are used to fund premium payments on life insurance policies issued by American National. The loans are secured by the cash values of the life insurance policies. If the customer were to default on a bank loan, American National would be obligated to pay off the loan. As the cash values of the life insurance policies always equal or exceed the balance of the loans, management does not foresee any loss on these guarantees. The total amount of the guarantees outstanding as of September 30, 2017, was approximately $206,376,000, while the total cash value of the related life insurance policies was approximately $208,361,000. Litigation American National and certain subsidiaries, in common with the insurance industry in general, are defendants in various lawsuits concerning alleged breaches of contracts, various employment matters, allegedly deceptive insurance sales and marketing practices, and miscellaneous other causes of action arising in the ordinary course of operations. Certain of these lawsuits include claims for compensatory and punitive damages. We provide accruals for these items to the extent we deem the losses probable and reasonably estimable. After reviewing these matters with legal counsel, based upon information presently available, management is of the opinion that the ultimate resultant liability, if any, would not have a material adverse effect on American National’s consolidated financial position, liquidity or results of operations; however, assessing the eventual outcome of litigation necessarily involves forward-looking speculation as to judgments to be made by judges, juries and appellate courts in the future. Such speculation warrants caution, as the frequency of large damage awards, which bear little or no relation to the economic damages incurred by plaintiffs in some jurisdictions, continues to create the potential for an unpredictable judgment in any given lawsuit. These lawsuits are in various stages of development, and future facts and circumstances could result in management changing its conclusions. It is possible that, if the defenses in these lawsuits are not successful, and the judgments are greater than management can anticipate, the resulting liability could have a material impact on our consolidated financial position, liquidity or results of operations. With respect to the existing litigation, management currently believes that the possibility of a material judgment adverse to American National is remote and no estimate of range can be made for loss contingencies that are at least reasonably possible but not accrued.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Note 17 – Related Party Transactions American National has entered into recurring transactions and agreements with certain related parties. These include mortgage loans, management contracts, agency commission contracts, marketing agreements, accident and health insurance contracts, and legal services. The impact on the consolidated financial statements of significant related party transactions is shown below (in thousands): Dollar Amount of Transactions Amount due to (from) American National Nine months ended September 30, September 30, December 31, Related Party Financial Statement Line Impacted 2017 2016 2017 2016 Gal-Tex Mortgage loan on real estate $ 1,139 $ 1,060 $ 2,617 $ 3,756 Gal-Tex Net investment income 177 256 16 23 Greer, Herz & Adams, LLP Other operating expenses 8,072 7,610 (374 ) (283 ) Mortgage Loans to Gal-Tex (“Gal-Tex”) Gal-Tex, Transactions with Greer, Herz & Adams, LLP

Summary of Significant Accoun25

Summary of Significant Accounting Policies and Practices (Policies)	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Basis of Accounting	The consolidated financial statements and notes thereto have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) and are reported in U.S. currency.
Consolidation Policy	American National consolidates entities that are wholly-owned and those in which American National owns less than 100% but controls, as well as variable interest entities in which American National is the primary beneficiary. Intercompany balances and transactions with consolidated entities have been eliminated. Investments in unconsolidated affiliates are accounted for using the equity method of accounting.
Reclassification Policy	Certain amounts in prior years have been reclassified to conform to current year presentation.
Use of Estimates	The preparation of the consolidated financial statements in conformity with GAAP requires the use of estimates and assumptions that affect the reported consolidated financial statement balances. Actual results could differ from those estimates.
Revision to Previously Reported Amounts	Revision to Previously Reported Amounts Correction of an Immaterial Error. Materiality, Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements 10-K . Financial statement amounts previously reported were revised as shown below (in thousands): Nine months ended September 30, 2016 As Reported As Revised Effect of Change Statement of Cash Flow Change in collateral held for derivatives $ — $ 14,032 $ 14,032 Other investing activities, net 9,242 14,040 4,798 Net cash used in investing activities (590,112 ) (571,282 ) 18,830 Net decrease in cash and cash equivalents (83,237 ) (64,407 ) 18,830 Cash at beginning of period 190,237 310,930 120,693 Cash at end of period 107,000 246,523 139,523

Summary of Significant Accoun26

Summary of Significant Accounting Policies and Practices (Tables)	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Schedule of Financial Statement Amounts Previously Reported	Financial statement amounts previously reported were revised as shown below (in thousands): Nine months ended September 30, 2016 As Reported As Revised Effect of Change Statement of Cash Flow Change in collateral held for derivatives $ — $ 14,032 $ 14,032 Other investing activities, net 9,242 14,040 4,798 Net cash used in investing activities (590,112 ) (571,282 ) 18,830 Net decrease in cash and cash equivalents (83,237 ) (64,407 ) 18,830 Cash at beginning of period 190,237 310,930 120,693 Cash at end of period 107,000 246,523 139,523

Investment in Securities (Table

Investment in Securities (Tables)	9 Months Ended
	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Investments in Securities	The cost or amortized cost and fair value of investments in securities are shown below (in thousands): September 30, 2017 Cost or Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value Fixed maturity securities, bonds held-to-maturity U.S. states and political subdivisions $ 271,297 $ 14,759 $ (22 ) $ 286,034 Foreign governments 4,023 657 — 4,680 Corporate debt securities 6,831,509 268,231 (15,252 ) 7,084,488 Residential mortgage-backed securities 232,678 11,504 (1,028 ) 243,154 Collateralized debt securities 925 50 — 975 Other debt securities 1,792 59 — 1,851 Total bonds held-to-maturity 7,342,224 295,260 (16,302 ) 7,621,182 Fixed maturity securities, bonds available-for-sale U.S. treasury and government 28,221 536 (41 ) 28,716 U.S. states and political subdivisions 892,998 32,890 (1,343 ) 924,545 Foreign governments 5,000 1,506 — 6,506 Corporate debt securities 4,868,920 200,900 (15,224 ) 5,054,596 Residential mortgage-backed securities 15,149 47 (173 ) 15,023 Collateralized debt securities 3,285 674 (4 ) 3,955 Other debt securities 11,625 440 (176 ) 11,889 Total bonds available-for-sale 5,825,198 236,993 (16,961 ) 6,045,230 Equity securities Common stock 745,018 940,944 (7,434 ) 1,678,528 Preferred stock 19,129 4,646 — 23,775 Total equity securities 764,147 945,590 (7,434 ) 1,702,303 Total investments in securities $ 13,931,569 $ 1,477,843 $ (40,697 ) $ 15,368,715 December 31, 2016 Cost or Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value Fixed maturity securities, bonds held-to-maturity U.S. states and political subdivisions $ 301,994 $ 17,190 $ (102 ) $ 319,082 Foreign governments 4,057 659 — 4,716 Corporate debt securities 6,711,508 253,191 (38,721 ) 6,925,978 Residential mortgage-backed securities 229,758 14,112 (1,185 ) 242,685 Collateralized debt securities 1,290 64 — 1,354 Other debt securities 2,778 99 — 2,877 Total bonds held-to-maturity 7,251,385 285,315 (40,008 ) 7,496,692 Fixed maturity securities, bonds available-for-sale U.S. treasury and government 25,062 594 (16 ) 25,640 U.S. states and political subdivisions 945,431 21,170 (6,378 ) 960,223 Foreign governments 5,000 1,567 — 6,567 Corporate debt securities 4,666,096 145,716 (31,049 ) 4,780,763 Residential mortgage-backed securities 18,588 2,267 (342 ) 20,513 Collateralized debt securities 5,574 821 (3 ) 6,392 Other debt securities 3,233 — (55 ) 3,178 Total bonds available-for-sale 5,668,984 172,135 (37,843 ) 5,803,276 Equity securities Common stock 713,099 810,611 (5,195 ) 1,518,515 Preferred stock 19,334 3,889 (62 ) 23,161 Total equity securities 732,433 814,500 (5,257 ) 1,541,676 Total investments in securities $ 13,652,802 $ 1,271,950 $ (83,108 ) $ 14,841,644
Maturities of Investments	The amortized cost and fair value, by contractual maturity, of fixed maturity securities are shown below (in thousands): September 30, 2017 Bonds Held-to-Maturity Bonds Available-for-Sale Amortized Cost Fair Value Amortized Cost Fair Value Due in one year or less $ 403,881 $ 410,402 $ 234,115 $ 237,826 Due after one year through five years 3,715,433 3,898,649 1,680,069 1,761,874 Due after five years through ten years 2,772,273 2,850,963 3,300,320 3,421,349 Due after ten years 444,787 456,149 610,694 624,181 Without single maturity date 5,850 5,019 — — Total $ 7,342,224 $ 7,621,182 $ 5,825,198 $ 6,045,230
Proceeds from Available for Sale Securities and Realized Gain Loss	Proceeds from sales of available-for-sale Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Proceeds from sales of available-for-sale $ 72,910 $ 36,950 $ 117,467 $ 79,681 Gross realized gains 31,397 12,990 46,385 21,574 Gross realized losses (4,837 ) (244 ) (4,983 ) (582 )
Change in Net Unrealized Gains (Losses) on Available-for-Sale Securities	The components of the change in net unrealized gains (losses) on securities are shown below (in thousands): Nine months ended September 30, 2017 2016 Bonds available-for-sale $ 85,740 $ 268,148 Equity securities 128,913 55,529 Change in net unrealized gains on securities during the year 214,653 323,677 Adjustments for Deferred policy acquisition costs (11,551 ) (70,426 ) Participating policyholders’ interest (9,140 ) (13,472 ) Deferred federal income tax expense (67,600 ) (83,713 ) Change in net unrealized gains on securities, net of tax $ 126,362 $ 156,066
Gross Unrealized Losses and Fair Value of Investment Securities	The gross unrealized losses and fair value of the investment securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, are shown below (in thousands): September 30, 2017 Less than 12 months 12 Months or more Total Unrealized (Losses) Fair Value Unrealized (Losses) Fair Value Unrealized (Losses) Fair Value Fixed maturity securities, bonds held-to-maturity U.S. states and political subdivisions $ (22 ) $ 3,030 $ — $ — $ (22 ) $ 3,030 Corporate debt securities (6,134 ) 521,274 (9,118 ) 147,053 (15,252 ) 668,327 Residential mortgage-backed securities (527 ) 57,465 (501 ) 9,249 (1,028 ) 66,714 Total bonds held-to-maturity (6,683 ) 581,769 (9,619 ) 156,302 (16,302 ) 738,071 Fixed maturity securities, bonds available-for-sale U.S. treasury and government (41 ) 21,969 — — (41 ) 21,969 U.S. states and political subdivisions (366 ) 39,274 (977 ) 27,202 (1,343 ) 66,476 Corporate debt securities (4,267 ) 361,101 (10,957 ) 134,308 (15,224 ) 495,409 Residential mortgage-backed securities (46 ) 12,570 (127 ) 1,492 (173 ) 14,062 Collateralized debt securities — — (4 ) 127 (4 ) 127 Other Debt Securities (176 ) 9,472 — — (176 ) 9,472 Total bonds available-for-sale (4,896 ) 444,386 (12,065 ) 163,129 (16,961 ) 607,515 Equity securities Common stock (7,434 ) 64,921 — — (7,434 ) 64,921 Total equity securities (7,434 ) 64,921 — — (7,434 ) 64,921 Total $ (19,013 ) $ 1,091,076 $ (21,684 ) $ 319,431 $ (40,697 ) $ 1,410,507 December 31, 2016 Less than 12 months 12 Months or more Total Unrealized Fair Value Unrealized (Losses) Fair Value Unrealized (Losses) Fair Fixed maturity securities, bonds held-to-maturity U.S. states and political subdivisions $ (102 ) $ 18,886 $ — $ — $ (102 ) $ 18,886 Corporate debt securities (18,110 ) 971,361 (20,611 ) 186,262 (38,721 ) 1,157,623 Residential mortgage-backed securities (558 ) 22,806 (627 ) 10,248 (1,185 ) 33,054 Total bonds held-to-maturity (18,770 ) 1,013,053 (21,238 ) 196,510 (40,008 ) 1,209,563 Fixed maturity securities, bonds available-for-sale U.S. treasury and government (16 ) 10,640 — — (16 ) 10,640 U.S. states and political subdivisions (6,376 ) 282,141 (2 ) 122 (6,378 ) 282,263 Corporate debt securities (19,828 ) 917,215 (11,221 ) 126,584 (31,049 ) 1,043,799 Residential mortgage-backed securities (204 ) 12,420 (138 ) 3,982 (342 ) 16,402 Collateralized debt securities — 1 (3 ) 146 (3 ) 147 Other Debt Securities (55 ) 3,178 — — (55 ) 3,178 Total bonds available-for-sale (26,479 ) 1,225,595 (11,364 ) 130,834 (37,843 ) 1,356,429 Equity securities Common stock (5,195 ) 53,068 — — (5,195 ) 53,068 Preferred stock (62 ) 4,324 — — (62 ) 4,324 Total equity securities (5,257 ) 57,392 — — (5,257 ) 57,392 Total $ (50,506 ) $ 2,296,040 $ (32,602 ) $ 327,344 $ (83,108 ) $ 2,623,384
Bond by Credit Quality Rating Distribution	The following table identifies the total bonds distributed by credit quality rating (in thousands, except percentages): September 30, 2017 December 31, 2016 Amortized Estimated % of Fair Amortized Estimated % of Fair Cost Fair Value Value Cost Fair Value Value AAA $ 633,694 $ 662,865 4.9 % $ 667,561 $ 691,296 5.2 % AA 1,302,818 1,357,106 9.9 1,393,137 1,440,667 10.8 A 4,643,929 4,822,438 35.3 4,538,471 4,696,909 35.3 BBB 6,095,264 6,343,348 46.4 5,758,560 5,931,112 44.6 BB and below 491,717 480,655 3.5 562,640 539,984 4.1 Total $ 13,167,422 $ 13,666,412 100.0 % $ 12,920,369 $ 13,299,968 100.0 %
Equity Securities by Market Sector Distribution	Equity securities by market sector distribution are shown below: September 30, 2017 December 31, 2016 Consumer goods 19.6 % 20.4 % Energy and utilities 8.9 11.1 Finance 21.9 22.1 Healthcare 13.1 12.7 Industrials 9.5 9.0 Information technology 19.1 17.1 Other 7.9 7.6 Total 100.0 % 100.0 %

Mortgage Loans (Tables)

Mortgage Loans (Tables)	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Distribution Based on Carrying Amount of Mortgage Loans by Location	The distribution based on carrying amount of mortgage loans by location is as follows: September 30, 2017 December 31, 2016 East North Central 14.9 % 16.2 % East South Central 3.2 3.7 Mountain 13.8 10.6 Pacific 18.6 17.6 South Atlantic 14.0 15.1 West South Central 29.1 31.0 Other 6.4 5.8 Total 100.0 % 100.0 %
Age Analysis of Past Due Loans	The age analysis of past due loans is shown below (in thousands): 30-59 Days 60-89 Days More Than Total September 30, 2017 Past Due Past Due 90 Days Total Current Amount Percent Industrial $ — $ — $ — $ — $ 756,086 $ 756,086 15.8 Office 10,103 6,235 8,882 25,220 1,703,700 1,728,920 36.0 Retail — — — — 749,982 749,982 15.6 Other — — — — 1,564,350 1,564,350 32.6 Total $ 10,103 $ 6,235 $ 8,882 $ 25,220 $ 4,774,118 $ 4,799,338 100.0 Allowance for loan losses (16,535 ) Total, net of allowance $ 4,782,803 December 31, 2016 Industrial $ — $ 2,300 $ — $ 2,300 $ 744,472 $ 746,772 17.1 Office — — 6,059 6,059 1,541,880 1,547,939 35.5 Retail — — — — 736,121 736,121 16.9 Other 20,179 9,280 — 29,459 1,300,245 1,329,704 30.5 Total $ 20,179 $ 11,580 $ 6,059 $ 37,818 $ 4,322,718 $ 4,360,536 100.0 Allowance for loan losses (12,490 ) Total, net of allowance $ 4,348,046
Change in Allowance for Credit Losses in Mortgage Loans	The change in allowance for credit losses in mortgage loans is shown below (in thousands, except number of loans): Collectively Evaluated for Impairment Individually Impaired Total Number of Loans Recorded Investment Valuation Allowance Number of Loans Recorded Investment Valuation Number of Loans Recorded Investment Valuation Allowance Beginning balance, 2017 430 $ 4,358,596 $ 11,488 2 $ 1,940 $ 1,002 432 $ 4,360,536 $ 12,490 Change in allowance — — 2,222 — — 1,823 — — 4,045 Net change in recorded investment 18 417,657 — 1 4,610 — 19 422,267 — Ending balance at September 30, 2017 448 $ 4,776,253 $ 13,710 3 $ 6,550 $ 2,825 451 $ 4,782,803 $ 16,535
Schedule of Troubled Debt Restructuring Mortgage Loan Information	Troubled debt restructuring mortgage loan information is as follows (in thousands, except number of loans): Nine months ended September 30, 2017 2016 Number of loans Recorded investment pre- modification Recorded investment post modification Number of loans Recorded investment pre- modification Recorded investment post modification Retail — $ — $ — 2 $ 10,189 $ 10,189 Offices 1 10,103 10,103 — — — Other (hotel/motel) 5 24,801 24,801 — — — Total 6 $ 34,904 $ 34,904 2 $ 10,189 $ 10,189

Real Estate and Other Investm29

Real Estate and Other Investments (Tables)	9 Months Ended
	Sep. 30, 2017
Real Estate [Abstract]
Investment Real Estate by Property-Type and Geographic Distribution	Investment real estate by property-type and geographic distribution are as follows: September 30, 2017 December 31, 2016 Industrial 5.9 % 9.2 % Office 39.9 37.8 Retail 38.5 37.2 Other 15.7 15.8 Total 100.0 % 100.0 % September 30, 2017 December 31, 2016 East North Central 6.2 % 8.8 % East South Central 3.5 3.4 Mountain 12.8 12.0 Pacific 7.7 6.1 South Atlantic 13.4 13.0 West South Central 51.9 52.2 Other 4.5 4.5 Total 100.0 % 100.0 %
Assets and Liabilities Related to VIEs	The assets and liabilities relating to the VIEs included in the consolidated financial statements are as follows (in thousands): September 30, 2017 December 31, 2016 Investment real estate $ 153,793 $ 173,816 Short-term investments 1,000 1 Cash and cash equivalents 4,146 6,099 Other receivables 4,645 6,456 Other assets 11,652 8,820 Total assets of consolidated VIEs $ 175,236 $ 195,192 Notes payable $ 138,165 $ 136,080 Other liabilities 5,103 10,037 Total liabilities of consolidated VIEs $ 143,268 $ 146,117
Schedule of Long-term Notes Payable of Consolidated VIEs	The total long-term notes payable of the consolidated VIE’s consists of the following (in thousands): Interest rate Maturity September 30, 2017 December 31, 2016 Prime 2018 $ 2 $ 1,267 LIBOR 2020 9,700 7,318 90 day LIBOR + 2.5% 2021 40,123 37,074 4% fixed 2022 88,340 90,421 Total $ 138,165 $ 136,080
Carrying Amount and Maximum Exposure to Loss Related to VIEs	The carrying amount and maximum exposure to loss relating to unconsolidated VIEs follows (in thousands): September 30, 2017 December 31, 2016 Maximum Maximum Carrying Exposure Carrying Exposure Amount to Loss Amount to Loss Investment in unconsolidated affiliates $ 341,802 $ 341,802 $ 323,933 $ 323,933 Mortgage loans 603,655 603,655 481,799 481,799 Accrued investment income 2,166 2,166 1,919 1,919

Derivative Instruments (Tables)

Derivative Instruments (Tables)	9 Months Ended
	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments Reported in Financial Position	The detail of derivative instruments is shown below (in thousands, except number of instruments): September 30, 2017 December 31, 2016 Derivatives Not Designated as Hedging Instruments Location in the Consolidated Statements of Financial Position Number of Instruments Notional Amounts Estimated Fair Value Number of Instruments Notional Amounts Estimated Fair Value Equity-indexed options Other invested assets 465 $ 1,739,400 $ 189,674 442 $ 1,414,100 $ 156,479 Equity-indexed embedded derivative Policyholders’ 72,684 1,642,300 439,246 62,481 1,289,800 314,330
Schedule of Derivative Instruments Reported in Statements of Operations	Derivatives Not Designated as Hedging Instruments Location in the Consolidated Statements of Operations Gains (Losses) Recognized in Income on Derivatives Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Equity-indexed options Net investment income $ 20,992 $ 15,040 $ 57,555 $ 17,190 Equity-indexed embedded derivative Interest credited to policyholders’ account balances (25,637 ) (15,054 ) (69,741 ) (21,227 )
Schedule of Information Regarding Company's Exposure to Credit Loss on the Options Holds	Information regarding the Company’s exposure to credit loss on the options it holds is presented below (in thousands): September 30, 2017 Counterparty Moody/S&P Rating Options Fair Value Collateral Held Collateral Amounts used to Excess and Restricted Collateral Exposure Net of Collateral Barclays Baa2/BBB $ 47,205 $ 47,623 $ 47,205 $ 418 $ — Goldman-Sachs A3/BBB+ 820 780 780 — 40 ING Baa1/A- 26,098 23,230 23,230 — 2,868 JP Morgan A3/A- 185 — — — 185 Morgan Stanley A3/BBB+ 15,930 16,376 15,930 446 — NATIXIS* A2/A 29,182 28,910 — 28,910 29,182 SunTrust Baa1/BBB+ 32,971 32,010 32,010 — 961 Wells Fargo A2/A 37,283 36,090 36,090 — 1,193 Total $ 189,674 $ 185,019 $ 155,245 $ 29,774 $ 34,429 December 31, 2016 Counterparty Moody/S&P Rating Options Fair Value Collateral Held Collateral Amounts used to Offset Exposure Excess and Restricted Collateral Exposure Net of Collateral Barclays Baa2/BBB $ 33,839 $ 35,063 $ 33,839 $ 1,224 $ — Citigroup Baa1/BBB+ 2,249 — — — 2,249 Goldman-Sachs A3/BBB+ 1,452 1,400 1,400 — 52 ING Baa1/A- 29,609 26,430 26,430 — 3,179 JP Morgan A3/A- 163 — — — 163 Morgan Stanley A3/BBB+ 17,864 17,680 17,680 — 184 NATIXIS* A2/A 24,804 26,620 — 26,620 24,804 SunTrust Baa1/BBB+ 19,559 19,960 19,559 401 — Wells Fargo A2/A 26,940 26,540 26,540 — 400 Total $ 156,479 $ 153,693 $ 125,448 $ 28,245 $ 31,031 * Collateral Restrictions

Net Investment Income and Rea31

Net Investment Income and Realized Investment Gains (Losses) (Tables)	9 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Summary of Net Investment Income	Net investment income is shown below (in thousands): Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Bonds $ 134,990 $ 137,322 $ 404,793 $ 416,301 Equity securities 9,688 9,094 28,694 28,421 Mortgage loans 54,913 61,277 179,933 158,593 Real estate 8,233 2,395 6,484 950 Options 20,992 15,040 57,555 17,190 Other invested assets 12,389 2,656 26,867 13,093 Total $ 241,205 $ 227,784 $ 704,326 $ 634,548
Summary of Realized Investment Gains (Losses)	Realized investment gains (losses) are shown below (in thousands): Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Bonds $ 6,116 $ 8,412 $ 16,184 $ 13,005 Equity securities 26,842 17,599 41,937 28,529 Mortgage loans (664 ) (883 ) (5,369 ) 176 Real estate (161 ) (2,928 ) 4,838 (2,655 ) Other invested assets 1,796 (19 ) 1,748 (846 ) Total $ 33,929 $ 22,181 $ 59,338 $ 38,209
Summary of Other Than Temporary Impairment Losses	Other-than-temporary impairment losses are shown below (in thousands): Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Bonds $ (47 ) $ (94 ) $ (6,047 ) $ (94 ) Equity securities (3,438 ) (5,820 ) (5,690 ) (12,847 ) Total $ (3,485 ) $ (5,914 ) $ (11,737 ) $ (12,941 )

Fair Value of Financial Instr32

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Carrying Amount and Fair Value of Financial Instruments	The carrying amount and fair value of financial instruments are shown below (in thousands): September 30, 2017 December 31, 2016 Carrying Amount Fair Value Carrying Amount Fair Value Financial assets Fixed maturity securities, bonds held-to-maturity $ 7,342,224 $ 7,621,182 $ 7,251,385 $ 7,496,692 Fixed maturity securities, bonds available-for-sale 6,045,230 6,045,230 5,803,276 5,803,276 Equity securities 1,702,303 1,702,303 1,541,676 1,541,676 Equity-indexed options 189,674 189,674 156,479 156,479 Mortgage loans on real estate, net of allowance 4,782,803 4,866,171 4,348,046 4,435,530 Policy loans 376,850 376,850 384,376 384,376 Short-term investments 561,773 561,773 192,226 192,226 Separate account assets 933,811 933,811 941,612 941,612 Total financial assets $ 21,934,668 $ 22,296,994 $ 20,619,076 $ 20,951,867 Financial liabilities Investment contracts $ 8,916,612 $ 8,916,612 $ 8,785,412 $ 8,785,412 Embedded derivative liability for equity-indexed contracts 439,246 439,246 314,330 314,330 Notes payable 138,165 138,165 136,080 136,080 Separate account liabilities 933,811 933,811 941,612 941,612 Total financial liabilities $ 10,427,834 $ 10,427,834 $ 10,177,434 $ 10,177,434
Schedule of Significant Unobservable Inputs Used to Calculate Level 3 Fair Value of Embedded Derivatives within Policyholder Contract Deposits	Shown below are the significant unobservable inputs used to calculate the Level 3 fair value of the embedded derivatives within policyholder contract deposits (in millions, except range percentages): Fair Value September 30, 2017 December 31, 2016 Unobservable Input Range Indexed Annuities $ 428.0 $ 306.5 Lapse Rate 1%-66% Mortality Multiplier 90%-100% Equity Volatility 12%-40% Indexed Life 11.2 7.8 Lapse Rate — Mortality Multiplier — Equity Volatility 12%-40%
Quantitative Disclosures Regarding Fair Value Hierarchy Measurements	The fair value hierarchy measurements of the financial instruments are shown below (in thousands): Fair Value Measurement as of September 30, 2017 Total Level 1 Level 2 Level 3 Financial assets Fixed maturity securities, bonds held-to-maturity U.S. states and political subdivisions $ 286,034 $ — $ 286,034 $ — Foreign governments 4,680 — 4,680 — Corporate debt securities 7,084,488 — 7,057,070 27,418 Residential mortgage-backed securities 243,154 — 242,279 875 Collateralized debt securities 975 — 975 — Other debt securities 1,851 — — 1,851 Total bonds held-to-maturity 7,621,182 — 7,591,038 30,144 Fixed maturity securities, bonds available-for-sale U.S. treasury and government 28,716 — 28,716 — U.S. states and political subdivisions 924,545 — 922,090 2,455 Foreign governments 6,506 — 6,506 — Corporate debt securities 5,054,596 — 5,054,209 387 Residential mortgage-backed securities 15,023 — 15,023 — Collateralized debt securities 3,955 — 3,955 — Other debt securities 11,889 — 11,889 — Total bonds available-for-sale 6,045,230 — 6,042,388 2,842 Equity securities Common stock 1,678,528 1,678,400 — 128 Preferred stock 23,775 23,775 — — Total equity securities 1,702,303 1,702,175 — 128 Options 189,674 — — 189,674 Mortgage loans on real estate 4,866,171 — 4,866,171 — Policy loans 376,850 — — 376,850 Short-term investments 561,773 — 561,773 — Separate account assets 933,811 — 933,811 — Total financial assets $ 22,296,994 $ 1,702,175 $ 19,995,181 $ 599,638 Financial liabilities Investment contracts $ 8,916,612 $ — $ — $ 8,916,612 Embedded derivative liability for equity-indexed contracts 439,246 — — 439,246 Notes payable 138,165 — — 138,165 Separate account liabilities 933,811 — 933,811 — Total financial liabilities $ 10,427,834 $ — $ 933,811 $ 9,494,023 Fair Value Measurement as of December 31, 2016 Total Level 1 Level 2 Level 3 Financial assets Fixed maturity securities, bonds held-to-maturity U.S. states and political subdivisions $ 319,082 $ — $ 319,082 $ — Foreign governments 4,716 — 4,716 — Corporate debt securities 6,925,978 — 6,875,015 50,963 Residential mortgage-backed securities 242,685 — 241,779 906 Collateralized debt securities 1,354 — — 1,354 Other debt securities 2,877 — — 2,877 Total bonds held-to-maturity 7,496,692 — 7,440,592 56,100 Fixed maturity securities, bonds available-for-sale U.S. treasury and government 25,640 — 25,640 — U.S. states and political subdivisions 960,223 — 957,748 2,475 Foreign governments 6,567 — 6,567 — Corporate debt securities 4,780,763 — 4,773,516 7,247 Residential mortgage-backed securities 20,513 — 17,909 2,604 Collateralized debt securities 6,392 — 4,454 1,938 Other debt securities 3,178 — 3,178 — Total bonds available-for-sale 5,803,276 — 5,789,012 14,264 Equity securities Common stock 1,518,515 1,518,515 — — Preferred stock 23,161 23,161 — — Total equity securities 1,541,676 1,541,676 — — Options 156,479 — — 156,479 Mortgage loans on real estate 4,435,530 — 4,435,530 — Policy loans 384,376 — — 384,376 Short-term investments 192,226 — 192,226 — Separate account assets 941,612 — 941,612 — Total financial assets $ 20,951,867 $ 1,541,676 $ 18,798,972 $ 611,219 Financial liabilities Investment contracts $ 8,785,412 $ — $ — $ 8,785,412 Embedded derivative liability for equity-indexed contracts 314,330 — — 314,330 Notes payable 136,080 — — 136,080 Separate account liabilities 941,612 — 941,612 — Total financial liabilities $ 10,177,434 $ — $ 941,612 $ 9,235,822
Financial Instruments Measured at Fair Value on Recurring Basis Using (Level 3) Inputs	For financial instruments measured at fair value on a recurring basis using Level 3 inputs during the period, a reconciliation of the beginning and ending balances is shown below (in thousands): Level 3 Three months ended September 30, Nine months ended September 30, Assets Liability Assets Liability Investment Equity-Indexed Embedded Investment Equity-Indexed Embedded Securities Options Derivative Securities Options Derivative Beginning balance, 2017 $ 15,852 $ 172,377 $ 390,189 $ 14,264 $ 156,479 $ 314,330 Total realized and unrealized investment losses included in other comprehensive income (3,703 ) — — (8,065 ) — — Net fair value change included in realized gains (losses) — — — — — — Net gain for derivatives included in net investment income — 20,671 — — 57,004 — Net change included in interest credited — — 25,637 — — 69,741 Purchases, sales and settlements or maturities Purchases — 12,047 — — 33,062 — Sales (5,297 ) — — (8,836 ) (12,837 ) — Settlements or maturities (4,010 ) (15,421 ) — (7,020 ) (44,034 ) — Premiums less benefits — — 23,420 — — 55,175 Carry value transfers in — — — 15,000 — — Gross transfers into Level 3 — — — 382 — — Gross transfers out of Level 3 — — — (2,883 ) — — Ending balance at September 30, 2017 $ 2,842 $ 189,674 $ 439,246 $ 2,842 $ 189,674 $ 439,246 Beginning balance, 2016 $ 21,666 $ 134,575 $ 278,570 $ 20,130 $ 123,007 $ 242,412 Total realized and unrealized investment gains included in other comprehensive income 128 — — 639 — — Net fair value change included in realized losses (2 ) — — (1 ) — — Net gain for derivatives included in net investment income — 14,716 — — 16,866 — Net change included in interest credited — — 15,054 — — 21,227 Purchases, sales and settlements or maturities Purchases — 7,786 — — 20,257 — Sales — — — — — — Settlements or maturities — (11,627 ) — (389 ) (14,680 ) — Premiums less benefits — — 4,875 — — 34,860 Gross transfers into Level 3 — — — 1,413 — — Gross transfers out of Level 3 (504 ) — — (504 ) — — Ending balance at September 30, 2016 $ 21,288 $ 145,450 $ 298,499 $ 21,288 $ 145,450 $ 298,499

Deferred Policy Acquisition C33

Deferred Policy Acquisition Costs (Tables)	9 Months Ended
	Sep. 30, 2017
Insurance [Abstract]
Deferred Policy Acquisition Costs	Deferred policy acquisition costs are shown below (in thousands): Life Annuity Accident & Health Property & Casualty Total Beginning balance, 2017 $ 745,840 $ 394,208 $ 40,620 $ 113,775 $ 1,294,443 Additions 92,752 77,414 8,435 215,626 394,227 Amortization (48,702 ) (54,438 ) (11,352 ) (210,328 ) (324,820 ) Effect of change in unrealized gains on available-for-sale (5,558 ) (5,993 ) — — (11,551 ) Net change 38,492 16,983 (2,917 ) 5,298 57,856 Ending balance at September 30, 2017 $ 784,332 $ 411,191 $ 37,703 $ 119,073 $ 1,352,299

Liability for Unpaid Claims a34

Liability for Unpaid Claims and Claim Adjustment Expenses (Tables)	9 Months Ended
	Sep. 30, 2017
Insurance [Abstract]
Liability for Unpaid Claims and Claim Adjustment Expenses	Information regarding the liability for unpaid claims is shown below (in thousands): Nine months ended September 30, 2017 2016 Unpaid claims balance, beginning $ 1,140,723 $ 1,104,302 Less reinsurance recoverables 216,903 217,337 Net beginning balance 923,820 886,965 Incurred related to Current 847,289 804,177 Prior years (61,284 ) (26,632 ) Total incurred claims 786,005 777,545 Paid claims related to Current 483,111 472,413 Prior years 259,478 271,701 Total paid claims 742,589 744,114 Net balance 967,236 920,396 Plus reinsurance recoverables 232,187 247,998 Unpaid claims balance, ending $ 1,199,423 $ 1,168,394

Federal Income Taxes (Tables)

Federal Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Effective Income Tax Reconciliation	A reconciliation of the effective tax rate to the statutory federal tax rate is shown below (in thousands, except percentages): Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Amount Rate Amount Rate Amount Rate Amount Rate Income tax on pre-tax $ 39,534 35.0 % $ 29,488 35.0 % $ 74,001 35.0 % $ 52,771 35.0 % Tax-exempt (1,737 ) (1.5 ) (1,980 ) (2.4 ) (5,338 ) (2.5 ) (5,926 ) (3.9 ) Deferred tax change 29 — — — (1,202 ) (0.6 ) (10,508 ) (7.0 ) Dividend exclusion (2,078 ) (1.8 ) (1,917 ) (2.3 ) (6,242 ) (3.0 ) (6,143 ) (4.1 ) Miscellaneous tax credits, net (2,268 ) (2.0 ) (2,430 ) (2.9 ) (7,067 ) (3.3 ) (7,546 ) (5.0 ) Low income housing tax credit expense 1,254 1.1 1,294 1.5 3,763 1.8 3,883 2.6 Other items, net 1,701 1.5 (1,907 ) (2.3 ) 2,023 0.9 (765 ) (0.5 ) Provision for federal income tax before interest expense 36,435 32.3 22,548 26.6 59,938 28.3 25,766 17.1 Interest expense (84 ) (0.1 ) 42 — — — 2,644 1.8 Total $ 36,351 32.2 % $ 22,590 26.6 % $ 59,938 28.3 % $ 28,410 18.9 %

Accumulated Other Comprehensi36

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Components of Other Comprehensive Income (Loss)	The components of and changes in the accumulated other comprehensive income (“AOCI”), and the related tax effects, are shown below (in thousands): Net Unrealized on Securities Defined Foreign AOCI Beginning balance, 2017 $ 547,138 $ (88,603 ) $ (2,636 ) $ 455,899 Amounts reclassified from AOCI (net of tax benefit $12,657 and expense $4,995) (23,507 ) 9,276 — (14,231 ) Unrealized holding gains arising during the period (net of tax expense $87,786) 163,031 — — 163,031 Unrealized adjustment to DAC (net of tax benefit $4,330) (7,221 ) — — (7,221 ) Unrealized gains on investments attributable to participating policyholders’ interest (net of tax benefit $3,199) (5,941 ) — — (5,941 ) Foreign currency adjustment (net of tax expense $374) — — 694 694 Ending balance at September 30, 2017 $ 673,500 $ (79,327 ) $ (1,942 ) $ 592,231 Beginning balance, 2016 $ 453,434 $ (97,889 ) $ (2,925 ) $ 352,620 Amounts reclassified from AOCI (net of tax benefit $7,078 and expense $3,438) (13,145 ) 6,384 — (6,761 ) Unrealized holding gains arising during the period (net of tax expense $120,365) 223,535 — — 223,535 Unrealized adjustment to DAC (net of tax benefit $24,859) (45,567 ) — — (45,567 ) Unrealized gains on investments attributable to participating policyholders’ interest (net of tax benefit $4,715) (8,757 ) — — (8,757 ) Foreign currency adjustment (net of tax benefit $361) — — (671 ) (671 ) Ending balance at September 30, 2016 $ 609,500 $ (91,505 ) $ (3,596 ) $ 514,399

Stockholders' Equity and Nonc37

Stockholders' Equity and Noncontrolling Interests (Tables)	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Common Stock, Amounts Outstanding	The amounts outstanding at the dates indicated are shown below: September 30, 2017 December 31, 2016 Common stock Shares issued 30,832,449 30,832,449 Treasury shares (3,900,565 ) (3,917,933 ) Outstanding shares 26,931,884 26,914,516 Restricted shares (74,000 ) (76,000 ) Unrestricted outstanding shares 26,857,884 26,838,516
Stock-Based Compensation Information	SAR, RS and RSU information for the periods indicated are shown below: SAR RS Shares RS Units Shares Weighted-Average Fair Value Shares Weighted-Average Fair Value Units Weighted-Average Fair Value Outstanding at December 31, 2016 6,153 $ 113.36 76,000 $ 110.73 100,445 $ 105.97 Granted — — — — 16,500 117.89 Exercised — — (2,000 ) 130.52 (62,079 ) 108.91 Forfeited — — — — (2,069 ) 104.17 Expired (3,234 ) 118.37 — — — — Outstanding at September 30, 2017 2,919 $ 107.81 74,000 $ 110.19 52,797 $ 106.26 SAR RS Shares RS Units Weighted-average contractual remaining life (in years) 0.77 3.01 0.90 Exercisable shares 2,919 N/A N/A Weighted-average exercise price $ 107.81 $ 110.19 $ 106.26 Weighted-average exercise price exercisable shares 107.81 N/A N/A Compensation expense (credit) Three months ended September 30, 2017 $ 5,000 $ 206,000 $ 565,000 Three months ended September 30, 2016 98,000 212,000 1,297,000 Nine months ended September 30, 2017 (44,000 ) 618,000 2,214,000 Nine months ended September 30, 2016 135,000 631,000 5,744,000 Fair value of liability award September 30, 2017 $ 34,000 N/A $ 6,479,000 December 31, 2016 (restated) 213,000 N/A 13,197,000
Summary of Basic and Diluted Earnings Per Share	Diluted earnings per share include RS and RSU award shares. Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Weighted average shares outstanding 26,894,538 26,908,032 26,895,952 26,908,619 Incremental shares from RS awards and RSUs 64,126 59,299 63,275 57,768 Total shares for diluted calculations 26,958,664 26,967,331 26,959,227 26,966,387 Net income attributable to American National (in thousands) $ 73,269 $ 59,289 $ 149,068 $ 121,230 Basic earnings per share $ 2.72 $ 2.20 $ 5.54 $ 4.51 Diluted earnings per share 2.72 2.20 5.53 4.50
Statutory Capital and Surplus and Net Income of Insurance Entities in Accordance with Statutory Accounting Practices	The statutory capital and surplus and net income of our life and property and casualty insurance entities in accordance with statutory accounting practices are shown below (in thousands): September 30, 2017 December 31, 2016 Statutory capital and surplus Life insurance entities $ 1,978,684 $ 1,921,171 Property and casualty insurance entities 1,102,644 1,074,525 Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Statutory net income Life insurance entities $ 9,674 $ 22,226 $ 28,016 $ 45,335 Property and casualty insurance entities 20,096 11,417 21,268 14,674

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Summary of Results of Operations Measured as Income Before Federal Income Taxes and Equity in Earnings of Unconsolidated Affiliates by Operating Segments	The following summarizes the results of operations measured as the income before federal income taxes, and equity in earnings of unconsolidated affiliates by operating segments (in thousands): Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Life $ 15,647 $ 9,547 $ 30,950 $ 22,832 Annuity 15,014 13,567 56,638 49,001 Health 3,714 (6,487 ) 9,263 (2,702 ) Property and Casualty 15,431 663 8,587 2,878 Corporate and Other 40,761 30,432 61,793 39,501 Total $ 90,567 $ 47,722 $ 167,231 $ 111,510

Related Party Transactions (Tab

Related Party Transactions (Tables)	9 Months Ended
	Sep. 30, 2017
Related Party Transactions [Abstract]
Related Party Transactions	The impact on the consolidated financial statements of significant related party transactions is shown below (in thousands): Dollar Amount of Transactions Amount due to (from) American National Nine months ended September 30, September 30, December 31, Related Party Financial Statement Line Impacted 2017 2016 2017 2016 Gal-Tex Mortgage loan on real estate $ 1,139 $ 1,060 $ 2,617 $ 3,756 Gal-Tex Net investment income 177 256 16 23 Greer, Herz & Adams, LLP Other operating expenses 8,072 7,610 (374 ) (283 )

Nature of Operations - Addition

Nature of Operations - Additional Information (Detail)	Sep. 30, 2017State
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of states	50

Summary of Significant Accoun41

Summary of Significant Accounting Policies and Practices - Additional Information (Detail)	Sep. 30, 2017
Maximum [Member]
Schedule Of Significant Accounting Policies [Line Items]
Entity ownership percentage	100.00%

Summary of Significant Accoun42

Summary of Significant Accounting Policies and Practices - Schedule of Financial Statement Amounts Previously Reported (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Change in collateral held for derivatives	$ 29,797	$ 14,032
Other investing activities, net	19,055	14,040
Net cash used in investing activities	(890,640)	(571,282)
Net decrease in cash and cash equivalents	61,390	(64,407)
Beginning of the period	289,338	310,930
Cash at end of period	$ 350,728	246,523
As Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other investing activities, net		9,242
Net cash used in investing activities		(590,112)
Net decrease in cash and cash equivalents		(83,237)
Beginning of the period		190,237
Cash at end of period		107,000
Effect of Change [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Change in collateral held for derivatives		14,032
Other investing activities, net		4,798
Net cash used in investing activities		18,830
Net decrease in cash and cash equivalents		18,830
Beginning of the period		120,693
Cash at end of period		$ 139,523

Recently Issued Accounting Pr43

Recently Issued Accounting Pronouncements - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Indentified contracts amount	$ 2,000,000
Maximum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percentage of total premium and other revenues	1.00%
Investment Securities [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net investment income from change in unrealized investment gains (losses) on securities	$ 129,000,000

Investment in Securities - Inve

Investment in Securities - Investments in Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Investment [Line Items]
Held-to-maturity securities, Cost or Amortized Cost	$ 7,342,224	$ 7,251,385
Held-to-maturity securities, Gross Unrealized Gains	295,260	285,315
Held-to-maturity securities, Gross Unrealized (Losses)	(16,302)	(40,008)
Held-to-maturity securities, Fair Value	7,621,182	7,496,692
Available-for-sale debt securities, Cost or Amortized Cost	5,825,198	5,668,984
Available-for-sale debt securities, Gross Unrealized Gains	236,993	172,135
Available-for-sale debt securities, Gross Unrealized (Losses)	(16,961)	(37,843)
Available-for-sale debt securities, Fair Value	6,045,230	5,803,276
Available-for-sale equity securities, Cost or Amortized Cost	764,147	732,433
Available-for-sale equity securities, Gross Unrealized Gains	945,590	814,500
Available-for-sale equity securities, Gross Unrealized (Losses)	(7,434)	(5,257)
Available-for-sale equity securities, Fair Value	1,702,303	1,541,676
Investments in securities, Cost or Amortized cost	13,931,569	13,652,802
Investments in securities, Gross Unrealized Gains	1,477,843	1,271,950
Investments in securities, Gross Unrealized (Losses)	(40,697)	(83,108)
Investments in securities, Fair Value	15,368,715	14,841,644
Foreign Governments [Member]
Investment [Line Items]
Held-to-maturity securities, Cost or Amortized Cost	4,023	4,057
Held-to-maturity securities, Gross Unrealized Gains	657	659
Held-to-maturity securities, Fair Value	4,680	4,716
Available-for-sale debt securities, Cost or Amortized Cost	5,000	5,000
Available-for-sale debt securities, Gross Unrealized Gains	1,506	1,567
Available-for-sale debt securities, Fair Value	6,506	6,567
Corporate Debt Securities [Member]
Investment [Line Items]
Held-to-maturity securities, Cost or Amortized Cost	6,831,509	6,711,508
Held-to-maturity securities, Gross Unrealized Gains	268,231	253,191
Held-to-maturity securities, Gross Unrealized (Losses)	(15,252)	(38,721)
Held-to-maturity securities, Fair Value	7,084,488	6,925,978
Available-for-sale debt securities, Cost or Amortized Cost	4,868,920	4,666,096
Available-for-sale debt securities, Gross Unrealized Gains	200,900	145,716
Available-for-sale debt securities, Gross Unrealized (Losses)	(15,224)	(31,049)
Available-for-sale debt securities, Fair Value	5,054,596	4,780,763
Preferred Stock [Member]
Investment [Line Items]
Available-for-sale equity securities, Cost or Amortized Cost	19,129	19,334
Available-for-sale equity securities, Gross Unrealized Gains	4,646	3,889
Available-for-sale equity securities, Gross Unrealized (Losses)		(62)
Available-for-sale equity securities, Fair Value	23,775	23,161
Common Stock [Member]
Investment [Line Items]
Available-for-sale equity securities, Cost or Amortized Cost	745,018	713,099
Available-for-sale equity securities, Gross Unrealized Gains	940,944	810,611
Available-for-sale equity securities, Gross Unrealized (Losses)	(7,434)	(5,195)
Available-for-sale equity securities, Fair Value	1,678,528	1,518,515
U.S. Treasury and Government [Member]
Investment [Line Items]
Available-for-sale debt securities, Cost or Amortized Cost	28,221	25,062
Available-for-sale debt securities, Gross Unrealized Gains	536	594
Available-for-sale debt securities, Gross Unrealized (Losses)	(41)	(16)
Available-for-sale debt securities, Fair Value	28,716	25,640
U.S. States and Political Subdivisions [Member]
Investment [Line Items]
Held-to-maturity securities, Cost or Amortized Cost	271,297	301,994
Held-to-maturity securities, Gross Unrealized Gains	14,759	17,190
Held-to-maturity securities, Gross Unrealized (Losses)	(22)	(102)
Held-to-maturity securities, Fair Value	286,034	319,082
Available-for-sale debt securities, Cost or Amortized Cost	892,998	945,431
Available-for-sale debt securities, Gross Unrealized Gains	32,890	21,170
Available-for-sale debt securities, Gross Unrealized (Losses)	(1,343)	(6,378)
Available-for-sale debt securities, Fair Value	924,545	960,223
Residential Mortgage-Backed Securities [Member]
Investment [Line Items]
Held-to-maturity securities, Cost or Amortized Cost	232,678	229,758
Held-to-maturity securities, Gross Unrealized Gains	11,504	14,112
Held-to-maturity securities, Gross Unrealized (Losses)	(1,028)	(1,185)
Held-to-maturity securities, Fair Value	243,154	242,685
Available-for-sale debt securities, Cost or Amortized Cost	15,149	18,588
Available-for-sale debt securities, Gross Unrealized Gains	47	2,267
Available-for-sale debt securities, Gross Unrealized (Losses)	(173)	(342)
Available-for-sale debt securities, Fair Value	15,023	20,513
Collateralized Debt Securities [Member]
Investment [Line Items]
Held-to-maturity securities, Cost or Amortized Cost	925	1,290
Held-to-maturity securities, Gross Unrealized Gains	50	64
Held-to-maturity securities, Fair Value	975	1,354
Available-for-sale debt securities, Cost or Amortized Cost	3,285	5,574
Available-for-sale debt securities, Gross Unrealized Gains	674	821
Available-for-sale debt securities, Gross Unrealized (Losses)	(4)	(3)
Available-for-sale debt securities, Fair Value	3,955	6,392
Other Debt Securities [Member]
Investment [Line Items]
Held-to-maturity securities, Cost or Amortized Cost	1,792	2,778
Held-to-maturity securities, Gross Unrealized Gains	59	99
Held-to-maturity securities, Fair Value	1,851	2,877
Available-for-sale debt securities, Cost or Amortized Cost	11,625	3,233
Available-for-sale debt securities, Gross Unrealized Gains	440
Available-for-sale debt securities, Gross Unrealized (Losses)	(176)	(55)
Available-for-sale debt securities, Fair Value	$ 11,889	$ 3,178

Investment in Securities - Matu

Investment in Securities - Maturities of Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Bonds Held-to-Maturity, Amortized Cost, Due in one year or less	$ 403,881
Bonds Held-to-Maturity, Amortized Cost, Due after one year through five years	3,715,433
Bonds Held-to-Maturity, Amortized Cost, Due after five years through ten years	2,772,273
Bonds Held-to-Maturity, Amortized Cost, Due after ten years	444,787
Bonds Held-to-Maturity, Amortized Cost, Without single maturity date	5,850
Held-to-maturity securities, Cost or Amortized Cost	7,342,224	$ 7,251,385
Bonds Held-to-Maturity, Fair Value, Due in one year or less	410,402
Bonds Held-to-Maturity, Fair Value, Due after one year through five years	3,898,649
Bonds Held-to-Maturity, Fair Value, Due after five years through ten years	2,850,963
Bonds Held-to-Maturity, Fair Value, Due after ten years	456,149
Bonds Held-to-Maturity, Fair Value, Without single maturity date	5,019
Held-to-maturity securities, Fair Value	7,621,182	7,496,692
Bonds Available-for-Sale, Amortized Cost, Due in one year or less	234,115
Bonds Available-for-Sale, Amortized Cost, Due after one year through five years	1,680,069
Bonds Available-for-Sale, Amortized Cost, Due after five years through ten years	3,300,320
Bonds Available-for-Sale, Amortized Cost, Due after ten years	610,694
Bonds Available-for-Sale, Amortized Cost, Without single maturity date	0
Available-for-sale debt securities, Cost or Amortized Cost	5,825,198	5,668,984
Bonds Available-for-Sale, Fair Value, Due in one year or less	237,826
Bonds Available-for-Sale, Fair Value, Due after one year through five years	1,761,874
Bonds Available-for-Sale, Fair Value, Due after five years through ten years	3,421,349
Bonds Available-for-Sale, Fair Value, Due after ten years	624,181
Bonds Available-for-Sale, Fair Value, Without single maturity date	0
Available-for-sale debt securities, Fair Value	$ 6,045,230	$ 5,803,276

Investment in Securities - Proc

Investment in Securities - Proceeds from Available for Sale Securities and Realized Gain Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Available-for-sale Securities, Gross Realized Gain (Loss), Disclosures [Abstract]
Proceeds from sales of available-for-sale securities	$ 72,910	$ 36,950	$ 117,467	$ 79,681
Gross realized gains	31,397	12,990	46,385	21,574
Gross realized losses	$ (4,837)	$ (244)	$ (4,983)	$ (582)

Investment in Securities - Addi

Investment in Securities - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Amortized Cost and Fair Value Debt Securities [Abstract]
Securities transferred from held-to-maturity to available-for-sale	$ 25,266,000	$ 0
Gross realized losses	$ 6,000,000

Investment in Securities - Chan

Investment in Securities - Change in Net Unrealized Gains (Losses) on Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Change in net unrealized gains on securities during the year			$ 214,653	$ 323,677
Adjustments for
Deferred policy acquisition costs			(11,551)	(70,426)
Participating policyholders' interest			(9,140)	(13,472)
Deferred federal income tax expense			(67,600)	(83,713)
Change in net unrealized gains on securities, net of tax	$ 29,774	$ 25,290	126,362	156,066
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in net unrealized gains on securities during the year			85,740	268,148
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in net unrealized gains on securities during the year			$ 128,913	$ 55,529

Investment in Securities - Gros

Investment in Securities - Gross Unrealized Losses and Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Investment [Line Items]
Bonds held-to-maturity, Less than 12 months, Unrealized (Losses)	$ (6,683)	$ (18,770)
Bonds held-to-maturity, Less than 12 months, Fair Value	581,769	1,013,053
Bonds held-to-maturity, 12 months or more, Unrealized (Losses)	(9,619)	(21,238)
Bonds held-to-maturity, 12 months or more, Fair Value	156,302	196,510
Bonds held-to-maturity, Total, Unrealized (Losses)	(16,302)	(40,008)
Bonds held-to-maturity, Total, Fair Value	738,071	1,209,563
Available-for-sale securities, Less than 12 months, Unrealized (Losses)	(4,896)	(26,479)
Available-for-sale securities, Less than 12 months, Fair Value	444,386	1,225,595
Available-for-sale securities, 12 months or more, Unrealized (Losses)	(12,065)	(11,364)
Available-for-sale securities, 12 months or more, Fair Value	163,129	130,834
Available-for-sale securities, Total, Unrealized (Losses)	(16,961)	(37,843)
Available-for-sale securities, Total, Fair Value	607,515	1,356,429
Investment in securities, Less than 12 months, Unrealized (Losses)	(19,013)	(50,506)
Investment in securities, Less than 12 months, Fair Value	1,091,076	2,296,040
Investment in securities, More than 12 months, Unrealized (Losses)	(21,684)	(32,602)
Investment in securities, More than 12 months, Fair Value	319,431	327,344
Investment in securities, Total, Unrealized (Losses)	(40,697)	(83,108)
Investment in securities, Total, Fair Value	1,410,507	2,623,384
Corporate Debt Securities [Member]
Investment [Line Items]
Bonds held-to-maturity, Less than 12 months, Unrealized (Losses)	(6,134)	(18,110)
Bonds held-to-maturity, Less than 12 months, Fair Value	521,274	971,361
Bonds held-to-maturity, 12 months or more, Unrealized (Losses)	(9,118)	(20,611)
Bonds held-to-maturity, 12 months or more, Fair Value	147,053	186,262
Bonds held-to-maturity, Total, Unrealized (Losses)	(15,252)	(38,721)
Bonds held-to-maturity, Total, Fair Value	668,327	1,157,623
Available-for-sale securities, Less than 12 months, Unrealized (Losses)	(4,267)	(19,828)
Available-for-sale securities, Less than 12 months, Fair Value	361,101	917,215
Available-for-sale securities, 12 months or more, Unrealized (Losses)	(10,957)	(11,221)
Available-for-sale securities, 12 months or more, Fair Value	134,308	126,584
Available-for-sale securities, Total, Unrealized (Losses)	(15,224)	(31,049)
Available-for-sale securities, Total, Fair Value	495,409	1,043,799
Preferred Stock [Member]
Investment [Line Items]
Available-for-sale securities, Less than 12 months, Unrealized (Losses)		(62)
Available-for-sale securities, Less than 12 months, Fair Value		4,324
Available-for-sale securities, Total, Unrealized (Losses)		(62)
Available-for-sale securities, Total, Fair Value		4,324
Common Stock [Member]
Investment [Line Items]
Available-for-sale securities, Less than 12 months, Unrealized (Losses)	(7,434)	(5,195)
Available-for-sale securities, Less than 12 months, Fair Value	64,921	53,068
Available-for-sale securities, Total, Unrealized (Losses)	(7,434)	(5,195)
Available-for-sale securities, Total, Fair Value	64,921	53,068
Equity Securities [Member]
Investment [Line Items]
Available-for-sale securities, Less than 12 months, Unrealized (Losses)	(7,434)	(5,257)
Available-for-sale securities, Less than 12 months, Fair Value	64,921	57,392
Available-for-sale securities, Total, Unrealized (Losses)	(7,434)	(5,257)
Available-for-sale securities, Total, Fair Value	64,921	57,392
U.S. Treasury and Government [Member]
Investment [Line Items]
Available-for-sale securities, Less than 12 months, Unrealized (Losses)	(41)	(16)
Available-for-sale securities, Less than 12 months, Fair Value	21,969	10,640
Available-for-sale securities, Total, Unrealized (Losses)	(41)	(16)
Available-for-sale securities, Total, Fair Value	21,969	10,640
U.S. States and Political Subdivisions [Member]
Investment [Line Items]
Bonds held-to-maturity, Less than 12 months, Unrealized (Losses)	(22)	(102)
Bonds held-to-maturity, Less than 12 months, Fair Value	3,030	18,886
Bonds held-to-maturity, Total, Unrealized (Losses)	(22)	(102)
Bonds held-to-maturity, Total, Fair Value	3,030	18,886
Available-for-sale securities, Less than 12 months, Unrealized (Losses)	(366)	(6,376)
Available-for-sale securities, Less than 12 months, Fair Value	39,274	282,141
Available-for-sale securities, 12 months or more, Unrealized (Losses)	(977)	(2)
Available-for-sale securities, 12 months or more, Fair Value	27,202	122
Available-for-sale securities, Total, Unrealized (Losses)	(1,343)	(6,378)
Available-for-sale securities, Total, Fair Value	66,476	282,263
Residential Mortgage-Backed Securities [Member]
Investment [Line Items]
Bonds held-to-maturity, Less than 12 months, Unrealized (Losses)	(527)	(558)
Bonds held-to-maturity, Less than 12 months, Fair Value	57,465	22,806
Bonds held-to-maturity, 12 months or more, Unrealized (Losses)	(501)	(627)
Bonds held-to-maturity, 12 months or more, Fair Value	9,249	10,248
Bonds held-to-maturity, Total, Unrealized (Losses)	(1,028)	(1,185)
Bonds held-to-maturity, Total, Fair Value	66,714	33,054
Available-for-sale securities, Less than 12 months, Unrealized (Losses)	(46)	(204)
Available-for-sale securities, Less than 12 months, Fair Value	12,570	12,420
Available-for-sale securities, 12 months or more, Unrealized (Losses)	(127)	(138)
Available-for-sale securities, 12 months or more, Fair Value	1,492	3,982
Available-for-sale securities, Total, Unrealized (Losses)	(173)	(342)
Available-for-sale securities, Total, Fair Value	14,062	16,402
Collateralized Debt Securities [Member]
Investment [Line Items]
Available-for-sale securities, Less than 12 months, Fair Value		1
Available-for-sale securities, 12 months or more, Unrealized (Losses)	(4)	(3)
Available-for-sale securities, 12 months or more, Fair Value	127	146
Available-for-sale securities, Total, Unrealized (Losses)	(4)	(3)
Available-for-sale securities, Total, Fair Value	127	147
Other Debt Securities [Member]
Investment [Line Items]
Available-for-sale securities, Less than 12 months, Unrealized (Losses)	(176)	(55)
Available-for-sale securities, Less than 12 months, Fair Value	9,472	3,178
Available-for-sale securities, Total, Unrealized (Losses)	(176)	(55)
Available-for-sale securities, Total, Fair Value	$ 9,472	$ 3,178

Investment in Securities - Bond

Investment in Securities - Bond by Credit Quality Rating Distribution (Detail) - Bonds [Member] - Credit Risk Financial Instruments [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Concentration Risk [Line Items]
Amortized Cost	$ 13,167,422	$ 12,920,369
Estimated Fair Value	$ 13,666,412	$ 13,299,968
Portfolio of investment by credit quality	100.00%	100.00%
AAA [Member]
Concentration Risk [Line Items]
Amortized Cost	$ 633,694	$ 667,561
Estimated Fair Value	$ 662,865	$ 691,296
Portfolio of investment by credit quality	4.90%	5.20%
AA [Member]
Concentration Risk [Line Items]
Amortized Cost	$ 1,302,818	$ 1,393,137
Estimated Fair Value	$ 1,357,106	$ 1,440,667
Portfolio of investment by credit quality	9.90%	10.80%
S&P A Rating [Member]
Concentration Risk [Line Items]
Amortized Cost	$ 4,643,929	$ 4,538,471
Estimated Fair Value	$ 4,822,438	$ 4,696,909
Portfolio of investment by credit quality	35.30%	35.30%
S&P BBB Rating [Member]
Concentration Risk [Line Items]
Amortized Cost	$ 6,095,264	$ 5,758,560
Estimated Fair Value	$ 6,343,348	$ 5,931,112
Portfolio of investment by credit quality	46.40%	44.60%
BB and Below [Member]
Concentration Risk [Line Items]
Amortized Cost	$ 491,717	$ 562,640
Estimated Fair Value	$ 480,655	$ 539,984
Portfolio of investment by credit quality	3.50%	4.10%

Investment in Securities - Equi

Investment in Securities - Equity Securities by Market Sector Distribution (Detail) - Equity Securities [Member] - Credit Concentration Risk [Member]	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Concentration Risk [Line Items]
Equity securities with market sector distribution	100.00%	100.00%
Consumer Goods [Member]
Concentration Risk [Line Items]
Equity securities with market sector distribution	19.60%	20.40%
Energy and Utilities [Member]
Concentration Risk [Line Items]
Equity securities with market sector distribution	8.90%	11.10%
Finance [Member]
Concentration Risk [Line Items]
Equity securities with market sector distribution	21.90%	22.10%
Healthcare [Member]
Concentration Risk [Line Items]
Equity securities with market sector distribution	13.10%	12.70%
Industrials [Member]
Concentration Risk [Line Items]
Equity securities with market sector distribution	9.50%	9.00%
Information Technology [Member]
Concentration Risk [Line Items]
Equity securities with market sector distribution	19.10%	17.10%
Other [Member]
Concentration Risk [Line Items]
Equity securities with market sector distribution	7.90%	7.60%

Mortgage Loans - Distribution B

Mortgage Loans - Distribution Based on Carrying Amount of Mortgage Loans by Location (Detail) - Mortgage Loans On Real Estate Concentration Risk [Member] - Geographic Concentration Risk [Member]	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Concentration Risk [Line Items]
Mortgage loans	100.00%	100.00%
East North Central [Member]
Concentration Risk [Line Items]
Mortgage loans	14.90%	16.20%
East South Central [Member]
Concentration Risk [Line Items]
Mortgage loans	3.20%	3.70%
Mountain [Member]
Concentration Risk [Line Items]
Mortgage loans	13.80%	10.60%
Pacific [Member]
Concentration Risk [Line Items]
Mortgage loans	18.60%	17.60%
South Atlantic [Member]
Concentration Risk [Line Items]
Mortgage loans	14.00%	15.10%
West South Central [Member]
Concentration Risk [Line Items]
Mortgage loans	29.10%	31.00%
Other [Member]
Concentration Risk [Line Items]
Mortgage loans	6.40%	5.80%

Mortgage Loans - Additional Inf

Mortgage Loans - Additional Information (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2017USD ($)MortgageLoan	Dec. 31, 2016USD ($)MortgageLoan
Receivables [Abstract]
Number of mortgage loan foreclosed | MortgageLoan	1	0
Mortgage loans foreclosed	$ 2,285,000
Mortgage loans foreclosure process	$ 14,926,000	$ 1,940,000
Number of loans in foreclosure process | MortgageLoan	3	1
Number of mortgage loans sold | MortgageLoan	0	0
Unamortized discounts	$ 59,000	$ 233,000
Unamortized origination fees, mortgage loans	31,980,000	$ 33,019,000
Commitment to lend additional funds to debtors with modified loans as TDRs	$ 7,739,000

Mortgage Loans - Age Analysis o

Mortgage Loans - Age Analysis of Past Due Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans Percent	100.00%	100.00%
Total Past Due	$ 25,220	$ 37,818
Current	4,774,118	4,322,718
Gross loan receivable amount	4,799,338	4,360,536
Allowance for loan losses	(16,535)	(12,490)
Total, net of allowance	$ 4,782,803	$ 4,348,046
Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans Percent	15.80%	17.10%
Total Past Due		$ 2,300
Current	$ 756,086	744,472
Gross loan receivable amount	$ 756,086	$ 746,772
Office [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans Percent	36.00%	35.50%
Total Past Due	$ 25,220	$ 6,059
Current	1,703,700	1,541,880
Gross loan receivable amount	$ 1,728,920	$ 1,547,939
Retail [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans Percent	15.60%	16.90%
Current	$ 749,982	$ 736,121
Gross loan receivable amount	$ 749,982	$ 736,121
Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans Percent	32.60%	30.50%
Total Past Due		$ 29,459
Current	$ 1,564,350	1,300,245
Gross loan receivable amount	1,564,350	1,329,704
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10,103	20,179
30-59 Days Past Due [Member] | Office [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10,103
30-59 Days Past Due [Member] | Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		20,179
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6,235	11,580
60-89 Days Past Due [Member] | Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		2,300
60-89 Days Past Due [Member] | Office [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6,235
60-89 Days Past Due [Member] | Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		9,280
More Than 90 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	8,882	6,059
More Than 90 Days [Member] | Office [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 8,882	$ 6,059

Mortgage Loans - Change in Allo

Mortgage Loans - Change in Allowance for Credit Losses in Mortgage Loans (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2017USD ($)Loans
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for Credit Losses, Collectively Evaluated for Impairment, Number of Loans, Beginning Balance | Loans	430
Allowance for Credit Losses, Collectively Evaluated for Impairment, Number of Loans, Net change in recorded investment | Loans	18
Allowance for Credit Losses, Collectively Evaluated for Impairment, Number of Loans, Ending Balance | Loans	448
Allowance for Credit Losses, Collectively Evaluated for Impairment, Recorded Investment, Beginning Balance	$ 4,358,596
Allowance for Credit Losses, Collectively Evaluated for Impairment, Recorded Investment, Net change in recorded investment	417,657
Allowance for Credit Losses, Collectively Evaluated for Impairment, Recorded Investment, Ending Balance	4,776,253
Allowance for Credit Losses, Collectively Evaluated for Impairment, Valuation Allowance, Beginning Balance	11,488
Allowance for Credit Losses, Collectively Evaluated for Impairment, Valuation Allowance, Change in allowance	2,222
Allowance for Credit Losses, Collectively Evaluated for Impairment, Valuation Allowance,, Ending Balance	$ 13,710
Allowance for Credit Losses, Individually Impaired, Number of Loans, Beginning Balance | Loans	2
Allowance for Credit Losses, Individually Impaired, Number of Loans, Net change in recorded investment | Loans	1
Allowance for Credit Losses, Individually Impaired, Number of Loans, Ending Balance | Loans	3
Allowance for Credit Losses, Individually Impaired, Recorded Investment, Beginning Balance	$ 1,940
Allowance for Credit Losses, Individually Impaired, Recorded Investment, Net change in recorded investment	4,610
Allowance for Credit Losses, Individually Impaired, Recorded Investment, Ending Balance	6,550
Allowance for Credit Losses, Individually Impaired, Valuation Allowance, Beginning Balance	1,002
Allowance for Credit Losses, Individually Impaired, Valuation Allowance, Change in allowance	1,823
Allowance for Credit Losses, Individually Impaired, Valuation Allowance, Ending Balance	$ 2,825
Allowance for Credit Losses, Number of Loans, Beginning Balance | Loans	432
Allowance for Credit Losses, Number of Loans, Net change in recorded investment | Loans	19
Allowance for Credit Losses, Number of Loans, Ending Balance | Loans	451
Allowance for Credit Losses, Recorded Investment, Beginning Balance	$ 4,360,536
Allowance for Credit Losses, Recorded Investment, Net change in recorded investment	422,267
Allowance for Credit Losses, Recorded Investment, Ending Balance	4,782,803
Allowance for Credit Losses, Valuation Allowance, Beginning Balance	12,490
Allowance for Credit Losses, Valuation Allowance, Change in allowance	4,045
Allowance for Credit Losses, Valuation Allowance, Ending Balance	$ 16,535

Mortgage Loans - Schedule of Tr

Mortgage Loans - Schedule of Troubled Debt Restructuring Mortgage Loan Information (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2017USD ($)Loans	Sep. 30, 2016USD ($)Loans
Financing Receivable, Modifications [Line Items]
Number of loans | Loans	6	2
Recorded investment pre-modification	$ 34,904	$ 10,189
Recorded investment post modification	$ 34,904	$ 10,189
Retail [Member]
Financing Receivable, Modifications [Line Items]
Number of loans | Loans		2
Recorded investment pre-modification		$ 10,189
Recorded investment post modification		$ 10,189
Office [Member]
Financing Receivable, Modifications [Line Items]
Number of loans | Loans	1
Recorded investment pre-modification	$ 10,103
Recorded investment post modification	$ 10,103
Other (Hotel/Motel) [Member]
Financing Receivable, Modifications [Line Items]
Number of loans | Loans	5
Recorded investment pre-modification	$ 24,801
Recorded investment post modification	$ 24,801

Real Estate and Other Investm57

Real Estate and Other Investments - Investment Real Estate by Property-Type and Geographic Distribution (Detail) - Real Estate [Member]	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Property Type Concentration Risk [Member]
Concentration Risk [Line Items]
Investment real estate	100.00%	100.00%
Property Type Concentration Risk [Member] | Industrial [Member]
Concentration Risk [Line Items]
Investment real estate	5.90%	9.20%
Property Type Concentration Risk [Member] | Office [Member]
Concentration Risk [Line Items]
Investment real estate	39.90%	37.80%
Property Type Concentration Risk [Member] | Retail [Member]
Concentration Risk [Line Items]
Investment real estate	38.50%	37.20%
Property Type Concentration Risk [Member] | Other [Member]
Concentration Risk [Line Items]
Investment real estate	15.70%	15.80%
Geographic Distribution [Member]
Concentration Risk [Line Items]
Investment real estate	100.00%	100.00%
Geographic Distribution [Member] | East North Central [Member]
Concentration Risk [Line Items]
Investment real estate	6.20%	8.80%
Geographic Distribution [Member] | East South Central [Member]
Concentration Risk [Line Items]
Investment real estate	3.50%	3.40%
Geographic Distribution [Member] | Mountain [Member]
Concentration Risk [Line Items]
Investment real estate	12.80%	12.00%
Geographic Distribution [Member] | Pacific [Member]
Concentration Risk [Line Items]
Investment real estate	7.70%	6.10%
Geographic Distribution [Member] | South Atlantic [Member]
Concentration Risk [Line Items]
Investment real estate	13.40%	13.00%
Geographic Distribution [Member] | West South Central [Member]
Concentration Risk [Line Items]
Investment real estate	51.90%	52.20%
Geographic Distribution [Member] | Other [Member]
Concentration Risk [Line Items]
Investment real estate	4.50%	4.50%

Real Estate and Other Investm58

Real Estate and Other Investments - Assets and Liabilities Related to VIEs (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Variable Interest Entity [Line Items]
Investment real estate	$ 549,264	$ 593,417
Short-term investments	561,773	192,226
Cash and cash equivalents	350,728	289,338	$ 246,523	$ 310,930
Other assets	146,024	169,962
Notes payable	138,165	136,080
Other liabilities	536,130	481,958
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Investment real estate	153,793	173,816
Short-term investments	1,000	1
Cash and cash equivalents	4,146	6,099
Other receivables	4,645	6,456
Other assets	11,652	8,820
Total assets of consolidated VIEs	175,236	195,192
Notes payable	138,165	136,080
Other liabilities	5,103	10,037
Total liabilities of consolidated VIEs	$ 143,268	$ 146,117

Real Estate and Other Investm59

Real Estate and Other Investments - Additional Information (Detail)	Sep. 30, 2017USD ($)Investment	Dec. 31, 2016USD ($)
Debt Disclosure [Abstract]
Maximum amount of investment in long-term notes payable | $	$ 28,552,000	$ 31,795,000
Number of real estate investment held for sale | Investment	0

Real Estate and Other Investm60

Real Estate and Other Investments - Schedule of Long-term Notes Payable of Consolidated VIEs (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Notes payable	$ 138,165	$ 136,080
Variable Interest Entity, Primary Beneficiary [Member]
Debt Instrument [Line Items]
Notes payable	$ 138,165	136,080
Long Term Notes Payable Due 2022 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Debt Instrument [Line Items]
Notes payable maturity year	2,022
Notes payable	$ 88,340	90,421
Prime [Member] | Long Term Notes Payable Due 2018 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Debt Instrument [Line Items]
Notes payable maturity year	2,018
Notes payable	$ 2	1,267
LIBOR [Member] | Long Term Notes Payable Due 2020 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Debt Instrument [Line Items]
Notes payable maturity year	2,020
Notes payable	$ 9,700	7,318
LIBOR [Member] | Long Term Notes Payable Due 2021 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Debt Instrument [Line Items]
Notes payable maturity year	2,021
Notes payable	$ 40,123	$ 37,074

Real Estate and Other Investm61

Real Estate and Other Investments - Schedule of Long-term Notes Payable of Consolidated VIEs (Parenthetical) (Detail) - Variable Interest Entity, Primary Beneficiary [Member]	9 Months Ended
	Sep. 30, 2017
Long Term Notes Payable Due 2018 [Member] | Prime [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	Prime
Long Term Notes Payable Due 2020 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	LIBOR
Long Term Notes Payable Due 2021 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	90 day LIBOR + 2.5%
Interest rate percentage	2.50%
Long Term Notes Payable Due 2022 [Member]
Debt Instrument [Line Items]
Interest rate on long-term notes	4.00%

Real Estate and Other Investm62

Real Estate and Other Investments - Carrying Amount and Maximum Exposure to Loss Related to VIEs (Detail) - Variable Interest Entity, Not Primary Beneficiary [Member] - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Mortgage Loans [Member]
Variable Interest Entity [Line Items]
Carrying Amount	$ 603,655	$ 481,799
Maximum Exposure to Loss	603,655	481,799
Investments in Unconsolidated Affiliates [Member]
Variable Interest Entity [Line Items]
Carrying Amount	341,802	323,933
Maximum Exposure to Loss	341,802	323,933
Accrued Investment Income [Member]
Variable Interest Entity [Line Items]
Carrying Amount	2,166	1,919
Maximum Exposure to Loss	$ 2,166	$ 1,919

Derivative Instruments - Schedu

Derivative Instruments - Schedule of Derivative Instruments Reported in Financial Position (Detail) - Derivatives Not Designated as Hedging Instruments [Member] $ in Thousands	Sep. 30, 2017USD ($)Derivative	Dec. 31, 2016USD ($)Derivative
Equity-Indexed Options [Member] | Other Invested Assets [Member]
Derivatives, Fair Value [Line Items]
Number of Instruments | Derivative	465	442
Derivative Notional Amount, Asset	$ 1,739,400	$ 1,414,100
Estimated Fair Value of other invested assets	$ 189,674	$ 156,479
Equity-Indexed Embedded Derivative [Member] | Policyholders' Account Balances [Member]
Derivatives, Fair Value [Line Items]
Number of Instruments | Derivative	72,684	62,481
Derivative Notional Amount, Liability	$ 1,642,300	$ 1,289,800
Derivative Financial Instruments, Estimated Fair Value	$ 439,246	$ 314,330

Derivative Instruments - Sche64

Derivative Instruments - Schedule of Derivative Instruments Reported in Statements of Operations (Detail) - Derivatives Not Designated as Hedging Instruments [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net Investment Income [Member] | Equity-Indexed Options [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in Income on Derivatives	$ 20,992	$ 15,040	$ 57,555	$ 17,190
Interest Credited to Policyholders' Account Balances [Member] | Equity-Indexed Embedded Derivative [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in Income on Derivatives	$ (25,637)	$ (15,054)	$ (69,741)	$ (21,227)

Derivative Instruments - Sche65

Derivative Instruments - Schedule of Information Regarding Company's Exposure to Credit Loss on the Options Holds (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Credit Derivatives [Line Items]
Options Fair Value	$ 189,674	$ 156,479
Collateral Held	185,019	153,693
Collateral Amounts used to Offset Exposure	155,245	125,448
Excess and Restricted Collateral	29,774	28,245
Exposure Net of Collateral	34,429	31,031
Barclays [Member] | Moody Baa2 Rating [Member] | S&P BBB Rating [Member]
Credit Derivatives [Line Items]
Options Fair Value	47,205	33,839
Collateral Held	47,623	35,063
Collateral Amounts used to Offset Exposure	47,205	33,839
Excess and Restricted Collateral	418	1,224
Citigroup [Member] | Moody Baa1 Rating [Member] | S&P BBB Plus Rating [Member]
Credit Derivatives [Line Items]
Options Fair Value		2,249
Exposure Net of Collateral		2,249
Goldman-Sachs [Member] | Moody A3 Rating [Member] | S&P BBB Plus Rating [Member]
Credit Derivatives [Line Items]
Options Fair Value	820	1,452
Collateral Held	780	1,400
Collateral Amounts used to Offset Exposure	780	1,400
Exposure Net of Collateral	40	52
ING [Member] | Moody Baa1 Rating [Member] | S&P A Minus Rating [Member]
Credit Derivatives [Line Items]
Options Fair Value	26,098	29,609
Collateral Held	23,230	26,430
Collateral Amounts used to Offset Exposure	23,230	26,430
Exposure Net of Collateral	2,868	3,179
JP Morgan | Moody A3 Rating [Member] | S&P A Minus Rating [Member]
Credit Derivatives [Line Items]
Options Fair Value	185	163
Exposure Net of Collateral	185	163
Morgan Stanley [Member] | Moody A3 Rating [Member] | S&P BBB Plus Rating [Member]
Credit Derivatives [Line Items]
Options Fair Value	15,930	17,864
Collateral Held	16,376	17,680
Collateral Amounts used to Offset Exposure	15,930	17,680
Excess and Restricted Collateral	446
Exposure Net of Collateral		184
NATIXIS [Member] | Moody A2 Rating [Member] | S&P A Rating [Member]
Credit Derivatives [Line Items]
Options Fair Value	29,182	24,804
Collateral Held	28,910	26,620
Excess and Restricted Collateral	28,910	26,620
Exposure Net of Collateral	29,182	24,804
Sun Trust [Member] | Moody Baa1 Rating [Member] | S&P BBB Plus Rating [Member]
Credit Derivatives [Line Items]
Options Fair Value	32,971	19,559
Collateral Held	32,010	19,960
Collateral Amounts used to Offset Exposure	32,010	19,559
Excess and Restricted Collateral		401
Exposure Net of Collateral	961
Wells Fargo [Member] | Moody A2 Rating [Member] | S&P A Rating [Member]
Credit Derivatives [Line Items]
Options Fair Value	37,283	26,940
Collateral Held	36,090	26,540
Collateral Amounts used to Offset Exposure	36,090	26,540
Exposure Net of Collateral	$ 1,193	$ 400

Net Investment Income and Rea66

Net Investment Income and Realized Investment Gains (Losses) - Summary of Net Investment Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net Investment Income [Line Items]
Net Investment Income, Total	$ 241,205	$ 227,784	$ 704,326	$ 634,548
Debt Securities [Member]
Net Investment Income [Line Items]
Net Investment Income, Total	134,990	137,322	404,793	416,301
Equity Securities [Member]
Net Investment Income [Line Items]
Net Investment Income, Total	9,688	9,094	28,694	28,421
Mortgage Loans [Member]
Net Investment Income [Line Items]
Net Investment Income, Total	54,913	61,277	179,933	158,593
Real Estate [Member]
Net Investment Income [Line Items]
Net Investment Income, Total	8,233	2,395	6,484	950
Other Invested Assets [Member]
Net Investment Income [Line Items]
Net Investment Income, Total	12,389	2,656	26,867	13,093
Options [Member]
Net Investment Income [Line Items]
Net Investment Income, Total	$ 20,992	$ 15,040	$ 57,555	$ 17,190

Net Investment Income and Rea67

Net Investment Income and Realized Investment Gains (Losses) - Summary of Realized Investment Gains (Losses) and Other Than Temporary Impairment Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Gain (Loss) on Investments [Line Items]
Realized investment gains (losses)	$ 33,929	$ 22,181	$ 59,338	$ 38,209
Other-than-temporary impairment losses	(3,485)	(5,914)	(11,737)	(12,941)
Debt Securities [Member]
Gain (Loss) on Investments [Line Items]
Realized investment gains (losses)	6,116	8,412	16,184	13,005
Other-than-temporary impairment losses	(47)	(94)	(6,047)	(94)
Equity Securities [Member]
Gain (Loss) on Investments [Line Items]
Realized investment gains (losses)	26,842	17,599	41,937	28,529
Other-than-temporary impairment losses	(3,438)	(5,820)	(5,690)	(12,847)
Mortgage Loans [Member]
Gain (Loss) on Investments [Line Items]
Realized investment gains (losses)	(664)	(883)	(5,369)	176
Real Estate [Member]
Gain (Loss) on Investments [Line Items]
Realized investment gains (losses)	(161)	(2,928)	4,838	(2,655)
Other Invested Assets [Member]
Gain (Loss) on Investments [Line Items]
Realized investment gains (losses)	$ 1,796	$ (19)	$ 1,748	$ (846)

Fair Value of Financial Instr68

Fair Value of Financial Instruments - Carrying Amount and Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financial assets
Fixed maturity securities, bonds held-to-maturity	$ 7,342,224	$ 7,251,385
Fixed maturity securities, bonds held-to-maturity	7,621,182	7,496,692
Fixed maturity securities, bonds available-for-sale	6,045,230	5,803,276
Equity securities	1,702,303	1,541,676
Mortgage loans on real estate, net of allowance	4,782,803	4,348,046
Policy loans	376,850	384,376
Short-term investments	561,773	192,226
Separate account assets	933,811	941,612
Financial liabilities
Notes payable	138,165	136,080
Separate account liabilities	933,811	941,612
Carrying Amount [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity	7,342,224	7,251,385
Fixed maturity securities, bonds available-for-sale	6,045,230	5,803,276
Equity securities	1,702,303	1,541,676
Equity-indexed options	189,674	156,479
Mortgage loans on real estate, net of allowance	4,782,803	4,348,046
Policy loans	376,850	384,376
Short-term investments	561,773	192,226
Separate account assets	933,811	941,612
Total financial assets	21,934,668	20,619,076
Financial liabilities
Investment contracts	8,916,612	8,785,412
Embedded derivative liability for equity-indexed contracts	439,246	314,330
Notes payable	138,165	136,080
Separate account liabilities	933,811	941,612
Total financial liabilities	10,427,834	10,177,434
Fair Value [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity	7,621,182	7,496,692
Fixed maturity securities, bonds available-for-sale	6,045,230	5,803,276
Equity securities	1,702,303	1,541,676
Equity-indexed options	189,674	156,479
Mortgage loans on real estate, net of allowance	4,866,171	4,435,530
Policy loans	376,850	384,376
Short-term investments	561,773	192,226
Separate account assets	933,811	941,612
Total financial assets	22,296,994	20,951,867
Financial liabilities
Investment contracts	8,916,612	8,785,412
Embedded derivative liability for equity-indexed contracts	439,246	314,330
Notes payable	138,165	136,080
Separate account liabilities	933,811	941,612
Total financial liabilities	$ 10,427,834	$ 10,177,434

Fair Value of Financial Instr69

Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Volatility rate used to estimate derivative values	13.50%		16.50%
Unrealized gain relating to assets still held and included in net investment income	$ 26,489,000	$ 34,146,000
Transfer between Level 1 and Level 2 fair value hierarchies	$ 0	$ 0

Fair Value - Schedule of Signif

Fair Value - Schedule of Significant Unobservable Inputs Used to Calculate Level 3 Fair Value of Embedded Derivatives within Policyholder Contract Deposits (Detail) - Policyholder Contract Deposits [Member] - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Indexed Annuities [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Derivative financial liabilities	$ 428	$ 306.5
Indexed Life [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Derivative financial liabilities	$ 11.2	$ 7.8
Minimum [Member] | Level 3 [Member] | Indexed Annuities [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Unobservable Input, Lapse Rate	1.00%
Unobservable Input, Mortality Multiplier	90.00%
Unobservable Input, Equity Volatility	12.00%
Minimum [Member] | Level 3 [Member] | Indexed Life [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Unobservable Input, Equity Volatility	12.00%
Maximum [Member] | Level 3 [Member] | Indexed Annuities [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Unobservable Input, Lapse Rate	66.00%
Unobservable Input, Mortality Multiplier	100.00%
Unobservable Input, Equity Volatility	40.00%
Maximum [Member] | Level 3 [Member] | Indexed Life [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Unobservable Input, Equity Volatility	40.00%

Fair Value of Financial Instr71

Fair Value of Financial Instruments - Quantitative Disclosures Regarding Fair Value Hierarchy Measurements (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financial assets
Fixed maturity securities, bonds held-to-maturity securities, fair value disclosure	$ 7,621,182	$ 7,496,692
Fixed maturity securities, bonds available-for-sale, fair value disclosure	6,045,230	5,803,276
Equity securities, fair value disclosure	1,702,303	1,541,676
Policy loans, fair value disclosure	376,850	384,376
Short-term investments, fair value disclosure	561,773	192,226
Separate account assets, fair value disclosure	933,811	941,612
Financial liabilities
Separate account liabilities, fair value disclosure	933,811	941,612
Preferred Stock [Member]
Financial assets
Equity securities, fair value disclosure	23,775	23,161
Foreign Governments [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity securities, fair value disclosure	4,680	4,716
Fixed maturity securities, bonds available-for-sale, fair value disclosure	6,506	6,567
Corporate Debt Securities [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity securities, fair value disclosure	7,084,488	6,925,978
Fixed maturity securities, bonds available-for-sale, fair value disclosure	5,054,596	4,780,763
U.S. States and Political Subdivisions [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity securities, fair value disclosure	286,034	319,082
Fixed maturity securities, bonds available-for-sale, fair value disclosure	924,545	960,223
Residential Mortgage-Backed Securities [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity securities, fair value disclosure	243,154	242,685
Fixed maturity securities, bonds available-for-sale, fair value disclosure	15,023	20,513
Collateralized Debt Securities [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity securities, fair value disclosure	975	1,354
Fixed maturity securities, bonds available-for-sale, fair value disclosure	3,955	6,392
Other Debt Securities [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity securities, fair value disclosure	1,851	2,877
Fixed maturity securities, bonds available-for-sale, fair value disclosure	11,889	3,178
U.S. Treasury and Government [Member]
Financial assets
Fixed maturity securities, bonds available-for-sale, fair value disclosure	28,716	25,640
Common Stock [Member]
Financial assets
Equity securities, fair value disclosure	1,678,528	1,518,515
Recurring [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity securities, fair value disclosure	7,621,182	7,496,692
Fixed maturity securities, bonds available-for-sale, fair value disclosure	6,045,230	5,803,276
Equity securities, fair value disclosure	1,702,303	1,541,676
Equity Indexed Options, fair value disclosure	189,674	156,479
Mortgage loans on real estate, net of allowance, fair value disclosure	4,866,171	4,435,530
Policy loans, fair value disclosure	376,850	384,376
Short-term investments, fair value disclosure	561,773	192,226
Separate account assets, fair value disclosure	933,811	941,612
Total financial assets, fair value disclosure	22,296,994	20,951,867
Financial liabilities
Investment contracts, fair value disclosure	8,916,612	8,785,412
Embedded derivative liability for equity-indexed contracts, fair value disclosure	439,246	314,330
Notes payable, fair value disclosure	138,165	136,080
Separate account liabilities, fair value disclosure	933,811	941,612
Total financial liabilities, fair value disclosure	10,427,834	10,177,434
Recurring [Member] | Preferred Stock [Member]
Financial assets
Equity securities, fair value disclosure	23,775	23,161
Recurring [Member] | Foreign Governments [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity securities, fair value disclosure	4,680	4,716
Fixed maturity securities, bonds available-for-sale, fair value disclosure	6,506	6,567
Recurring [Member] | Corporate Debt Securities [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity securities, fair value disclosure	7,084,488	6,925,978
Fixed maturity securities, bonds available-for-sale, fair value disclosure	5,054,596	4,780,763
Recurring [Member] | Level 1 [Member]
Financial assets
Equity securities, fair value disclosure	1,702,175	1,541,676
Total financial assets, fair value disclosure	1,702,175	1,541,676
Recurring [Member] | Level 1 [Member] | Preferred Stock [Member]
Financial assets
Equity securities, fair value disclosure	23,775	23,161
Recurring [Member] | Level 2 [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity securities, fair value disclosure	7,591,038	7,440,592
Fixed maturity securities, bonds available-for-sale, fair value disclosure	6,042,388	5,789,012
Mortgage loans on real estate, net of allowance, fair value disclosure	4,866,171	4,435,530
Short-term investments, fair value disclosure	561,773	192,226
Separate account assets, fair value disclosure	933,811	941,612
Total financial assets, fair value disclosure	19,995,181	18,798,972
Financial liabilities
Separate account liabilities, fair value disclosure	933,811	941,612
Total financial liabilities, fair value disclosure	933,811	941,612
Recurring [Member] | Level 2 [Member] | Foreign Governments [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity securities, fair value disclosure	4,680	4,716
Fixed maturity securities, bonds available-for-sale, fair value disclosure	6,506	6,567
Recurring [Member] | Level 2 [Member] | Corporate Debt Securities [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity securities, fair value disclosure	7,057,070	6,875,015
Fixed maturity securities, bonds available-for-sale, fair value disclosure	5,054,209	4,773,516
Recurring [Member] | Level 3 [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity securities, fair value disclosure	30,144	56,100
Fixed maturity securities, bonds available-for-sale, fair value disclosure	2,842	14,264
Equity securities, fair value disclosure	128
Equity Indexed Options, fair value disclosure	189,674	156,479
Policy loans, fair value disclosure	376,850	384,376
Total financial assets, fair value disclosure	599,638	611,219
Financial liabilities
Investment contracts, fair value disclosure	8,916,612	8,785,412
Embedded derivative liability for equity-indexed contracts, fair value disclosure	439,246	314,330
Notes payable, fair value disclosure	138,165	136,080
Total financial liabilities, fair value disclosure	9,494,023	9,235,822
Recurring [Member] | Level 3 [Member] | Corporate Debt Securities [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity securities, fair value disclosure	27,418	50,963
Fixed maturity securities, bonds available-for-sale, fair value disclosure	387	7,247
Recurring [Member] | U.S. States and Political Subdivisions [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity securities, fair value disclosure	286,034	319,082
Fixed maturity securities, bonds available-for-sale, fair value disclosure	924,545	960,223
Recurring [Member] | U.S. States and Political Subdivisions [Member] | Level 2 [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity securities, fair value disclosure	286,034	319,082
Fixed maturity securities, bonds available-for-sale, fair value disclosure	922,090	957,748
Recurring [Member] | U.S. States and Political Subdivisions [Member] | Level 3 [Member]
Financial assets
Fixed maturity securities, bonds available-for-sale, fair value disclosure	2,455	2,475
Recurring [Member] | Residential Mortgage-Backed Securities [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity securities, fair value disclosure	243,154	242,685
Fixed maturity securities, bonds available-for-sale, fair value disclosure	15,023	20,513
Recurring [Member] | Residential Mortgage-Backed Securities [Member] | Level 2 [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity securities, fair value disclosure	242,279	241,779
Fixed maturity securities, bonds available-for-sale, fair value disclosure	15,023	17,909
Recurring [Member] | Residential Mortgage-Backed Securities [Member] | Level 3 [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity securities, fair value disclosure	875	906
Fixed maturity securities, bonds available-for-sale, fair value disclosure		2,604
Recurring [Member] | Collateralized Debt Securities [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity securities, fair value disclosure	975	1,354
Fixed maturity securities, bonds available-for-sale, fair value disclosure	3,955	6,392
Recurring [Member] | Collateralized Debt Securities [Member] | Level 2 [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity securities, fair value disclosure	975
Fixed maturity securities, bonds available-for-sale, fair value disclosure	3,955	4,454
Recurring [Member] | Collateralized Debt Securities [Member] | Level 3 [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity securities, fair value disclosure		1,354
Fixed maturity securities, bonds available-for-sale, fair value disclosure		1,938
Recurring [Member] | Other Debt Securities [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity securities, fair value disclosure	1,851	2,877
Fixed maturity securities, bonds available-for-sale, fair value disclosure	11,889	3,178
Recurring [Member] | Other Debt Securities [Member] | Level 2 [Member]
Financial assets
Fixed maturity securities, bonds available-for-sale, fair value disclosure	11,889	3,178
Recurring [Member] | Other Debt Securities [Member] | Level 3 [Member]
Financial assets
Fixed maturity securities, bonds held-to-maturity securities, fair value disclosure	1,851	2,877
Recurring [Member] | U.S. Treasury and Government [Member]
Financial assets
Fixed maturity securities, bonds available-for-sale, fair value disclosure	28,716	25,640
Recurring [Member] | U.S. Treasury and Government [Member] | Level 2 [Member]
Financial assets
Fixed maturity securities, bonds available-for-sale, fair value disclosure	28,716	25,640
Recurring [Member] | Common Stock [Member]
Financial assets
Equity securities, fair value disclosure	1,678,528	1,518,515
Recurring [Member] | Common Stock [Member] | Level 1 [Member]
Financial assets
Equity securities, fair value disclosure	1,678,400	$ 1,518,515
Recurring [Member] | Common Stock [Member] | Level 3 [Member]
Financial assets
Equity securities, fair value disclosure	$ 128

Fair Value of Financial Instr72

Fair Value of Financial Instruments - Financial Instruments Measured at Fair Value on Recurring Basis Using (Level 3) Inputs (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Equity-Indexed Embedded Derivative [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 390,189	$ 278,570	$ 314,330	$ 242,412
Total realized and unrealized investment gains (losses) included in other comprehensive income	0	0	0	0
Net fair value change included in realized gains (losses)	0	0	0	0
Net gain (loss) for derivatives included in net investment income	0	0	0	0
Net change included in interest credited	25,637	15,054	69,741	21,227
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements or maturities	0	0	0	0
Premiums less benefits	23,420	4,875	55,175	34,860
Carry value transfers in	0		0
Gross transfers into Level 3	0	0	0	0
Gross transfers out of Level 3	0	0	0	0
Ending balance	439,246	298,499	439,246	298,499
Investment Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	15,852	21,666	14,264	20,130
Total realized and unrealized investment gains (losses) included in other comprehensive income	(3,703)	128	(8,065)	639
Net fair value change included in realized gains (losses)		(2)		(1)
Net change included in interest credited	0	0	0	0
Sales	(5,297)		(8,836)
Settlements or maturities	(4,010)		(7,020)	(389)
Premiums less benefits	0	0	0	0
Carry value transfers in			15,000
Gross transfers into Level 3			382	1,413
Gross transfers out of Level 3		(504)	(2,883)	(504)
Ending balance	2,842	21,288	2,842	21,288
Equity-Indexed Options [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	172,377	134,575	156,479	123,007
Net gain (loss) for derivatives included in net investment income	20,671	14,716	57,004	16,866
Net change included in interest credited	0	0	0	0
Purchases	12,047	7,786	33,062	20,257
Sales			(12,837)
Settlements or maturities	(15,421)	(11,627)	(44,034)	(14,680)
Premiums less benefits	0	0	0	0
Ending balance	$ 189,674	$ 145,450	$ 189,674	$ 145,450

Deferred Policy Acquisition C73

Deferred Policy Acquisition Costs - Deferred Policy Acquisition Costs (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Deferred Policy Acquisition Costs [Line Items]
Beginning balance	$ 1,294,443
Additions	394,227
Amortization	(324,820)
Effect of change in unrealized gains on available-for-sale securities	(11,551)	$ (70,426)
Net change	57,856
Ending balance	1,352,299
Life [Member]
Deferred Policy Acquisition Costs [Line Items]
Beginning balance	745,840
Additions	92,752
Amortization	(48,702)
Effect of change in unrealized gains on available-for-sale securities	(5,558)
Net change	38,492
Ending balance	784,332
Annuity [Member]
Deferred Policy Acquisition Costs [Line Items]
Beginning balance	394,208
Additions	77,414
Amortization	(54,438)
Effect of change in unrealized gains on available-for-sale securities	(5,993)
Net change	16,983
Ending balance	411,191
Accident and Health [Member]
Deferred Policy Acquisition Costs [Line Items]
Beginning balance	40,620
Additions	8,435
Amortization	(11,352)
Net change	(2,917)
Ending balance	37,703
Property and Casualty [Member]
Deferred Policy Acquisition Costs [Line Items]
Beginning balance	113,775
Additions	215,626
Amortization	(210,328)
Net change	5,298
Ending balance	$ 119,073

Liability for Unpaid Claims a74

Liability for Unpaid Claims and Claim Adjustment Expenses - Liability for Unpaid Claims and Claim Adjustment Expenses (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Liability For Unpaid Claims And Claims Adjustment Expense Net
Unpaid claims balance, beginning	$ 1,303,925
Less reinsurance recoverables	401,709
Paid claims related to
Plus reinsurance recoverables	408,772
Unpaid claims balance, ending	1,365,155
Property and Casualty Accident and Health [Member]
Liability For Unpaid Claims And Claims Adjustment Expense Net
Unpaid claims balance, beginning	1,140,723	$ 1,104,302
Less reinsurance recoverables	216,903	217,337
Net beginning balance	923,820	886,965
Incurred related to
Current	847,289	804,177
Prior years	(61,284)	(26,632)
Total incurred claims	786,005	777,545
Paid claims related to
Current	483,111	472,413
Prior years	259,478	271,701
Total paid claims	742,589	744,114
Net balance	967,236	920,396
Plus reinsurance recoverables	232,187	247,998
Unpaid claims balance, ending	$ 1,199,423	$ 1,168,394

Liability for Unpaid Claims a75

Liability for Unpaid Claims and Claim Adjustment Expenses - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Insurance [Abstract]
Description of increase (decrease) in claims and claim adjustment expenses	The net and gross reserve calculations have shown favorable development as a result of favorable loss emergence compared to what was implied by the loss development patterns used in the original estimation of losses in prior years.
Decrease in claims and claim adjustments expenses amount	$ 61,284,000	$ 26,632,000
Liability for unpaid claims and claim adjustment expenses	$ 29,887,000

Federal Income Taxes - Effectiv

Federal Income Taxes - Effective Income Tax Reconciliation (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Income tax on pre-tax income	$ 39,534	$ 29,488	$ 74,001	$ 52,771
Tax-exempt investment income	(1,737)	(1,980)	(5,338)	(5,926)
Deferred tax change	29		(1,202)	(10,508)
Dividend exclusion	(2,078)	(1,917)	(6,242)	(6,143)
Miscellaneous tax credits, net	(2,268)	(2,430)	(7,067)	(7,546)
Low income housing tax credit expense	1,254	1,294	3,763	3,883
Other items, net	1,701	(1,907)	2,023	(765)
Provision for federal income tax before interest expense	36,435	22,548	59,938	25,766
Interest expense	(84)	42		2,644
Total provision for federal income taxes	$ 36,351	$ 22,590	$ 59,938	$ 28,410
Income tax on pre-tax income	35.00%	35.00%	35.00%	35.00%
Tax-exempt investment income	(1.50%)	(2.40%)	(2.50%)	(3.90%)
Deferred tax change			(0.60%)	(7.00%)
Dividend exclusion	(1.80%)	(2.30%)	(3.00%)	(4.10%)
Miscellaneous tax credits, net	(2.00%)	(2.90%)	(3.30%)	(5.00%)
Low income housing tax credit expense	1.10%	1.50%	1.80%	2.60%
Other items, net	1.50%	(2.30%)	0.90%	(0.50%)
Provision for federal income tax before interest expense	32.30%	26.60%	28.30%	17.10%
Interest expense	(0.10%)			1.80%
Total, Rate	32.20%	26.60%	28.30%	18.90%

Federal Income Taxes - Addition

Federal Income Taxes - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Schedule Of Income Taxes [Line Items]
Income taxes paid or refunded, net	$ 8,466,000	$ 35,458,000
Valuation allowance	0
Operating loss tax carryforwards subject to expiration	$ 0
Operating loss tax carryforwards expiration date	Dec. 31, 2017
Provision for penalties or interest recognized relating to dispute with Internal Revenue Service	$ 0
Federal income tax refunds	8,000,000
Capital Loss Carryforward [Member]
Schedule Of Income Taxes [Line Items]
Capital loss tax carryforwards subject to expiration	$ 0
Capital loss tax carryforwards expiration date	Dec. 31, 2017

Accumulated Other Comprehensi78

Accumulated Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of the period			$ 4,661,495
Foreign currency adjustment, net of tax expense (benefit)	$ 411	$ (1,101)	694	$ (671)
Balance at end of the period	4,883,546	4,681,399	4,883,546	4,681,399
Net Unrealized Gains (Losses) on Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of the period			547,138	453,434
Amounts reclassified from AOCI, net of tax expense (benefit)			(23,507)	(13,145)
Unrealized holding gains arising during the period, net of tax expense (benefit)			163,031	223,535
Unrealized adjustment to DAC, net of tax expense (benefit)			(7,221)	(45,567)
Unrealized gains on investments attributable to participating policyholders' interest, net of tax expense (benefit)			(5,941)	(8,757)
Balance at end of the period	673,500	609,500	673,500	609,500
Defined Benefit Pension Plan Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of the period			(88,603)	(97,889)
Amounts reclassified from AOCI, net of tax expense (benefit)			9,276	6,384
Balance at end of the period	(79,327)	(91,505)	(79,327)	(91,505)
Foreign Currency Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of the period			(2,636)	(2,925)
Foreign currency adjustment, net of tax expense (benefit)			694	(671)
Balance at end of the period	(1,942)	(3,596)	(1,942)	(3,596)
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of the period			455,899	352,620
Amounts reclassified from AOCI, net of tax expense (benefit)			(14,231)	(6,761)
Unrealized holding gains arising during the period, net of tax expense (benefit)			163,031	223,535
Unrealized adjustment to DAC, net of tax expense (benefit)			(7,221)	(45,567)
Unrealized gains on investments attributable to participating policyholders' interest, net of tax expense (benefit)			(5,941)	(8,757)
Foreign currency adjustment, net of tax expense (benefit)			694	(671)
Balance at end of the period	$ 592,231	$ 514,399	$ 592,231	$ 514,399

Accumulated Other Comprehensi79

Accumulated Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Parenthetical) (Detail) - Accumulated Other Comprehensive Income [Member] - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from AOCI, sale of securities tax expense (benefit)	$ 12,657	$ 7,078
Amounts reclassified from AOCI, pension tax expense (benefit)	4,995	3,438
Unrealized holding gains arising during the period, tax expense (benefit)	87,786	120,365
Unrealized adjustment to deferred policy acquisition costs, tax expense (benefit)	4,330	24,859
Unrealized gains on investments attributable to participating policyholders' interest, tax expense (benefit)	3,199	4,715
Foreign currency adjustment, tax expense (benefit)	$ 374	$ 361

Stockholders' Equity and Nonc80

Stockholders' Equity and Noncontrolling Interests - Additional Information (Detail) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, par value	$ 1		$ 1
Common stock, shares authorized	50,000,000		50,000,000
Maximum limit of shares available for grants under stock-based compensation plan	2,900,000
Maximum limit of shares granted to any one individual in any calendar year	200,000
Risk based capital action level percentage	200.00%
Description of regulatory capital requirement	American National Insurance Company's payment of dividends to stockholders is restricted by insurance law. The restrictions require life insurance companies to maintain minimum amounts of capital and surplus, and in the absence of special approval, limit the payment of dividends to the greater of the prior year's statutory net income from operations, or 10% of prior year statutory surplus.
Noncontrolling interest	$ 9,474,000		$ 9,317,000
Parent Company [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Statutory capital and surplus	3,070,652,000		2,985,909,000
Subsidiaries [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Noncontrolling interest	$ 2,724,000		$ 2,567,000
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk based capital action level percentage	200.00%		200.00%
Scenario, Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Statutory amount available for dividend payments without regulatory approval				$ 298,591,000
Insurance Subsidiary [Member] | Missouri [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Statutory accounting practices permitted practice amount	$ 63,571,000	$ 66,683,000
County Mutual [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Noncontrolling interest	$ 6,750,000		$ 6,750,000
Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Expiration of vesting period	5 years
Stock Appreciation Rights [Member] | Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate per year	20.00%
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	10 years
Shares granted	350,334
Exercise price of Restricted shares granted	$ 0
Number of shares unvested	74,000
Lapse restrictions on restricted stock awards	10 years
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period description	RSUs granted vest after a one-year or three-year graded vesting requirement or over a shorter period as a result of death, disability or retirement after age 65.
Restricted Stock Units [Member] | Graded Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years

Stockholders' Equity and Nonc81

Stockholders' Equity and Noncontrolling Interests - Common Stock, Amounts Outstanding (Detail) - shares	Sep. 30, 2017	Dec. 31, 2016
Stockholders' Equity Note [Abstract]
Shares issued	30,832,449	30,832,449
Treasury shares	(3,900,565)	(3,917,933)
Outstanding shares	26,931,884	26,914,516
Restricted shares	(74,000)	(76,000)
Unrestricted outstanding shares	26,857,884	26,838,516

Stockholders' Equity and Nonc82

Stockholders' Equity and Noncontrolling Interests - Stock-Based Compensation Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, Shares			6,153
Expired, Shares			(3,234)
Ending balance, Shares	2,919		2,919
Weighted-Average Grant Date Fair Value, Beginning balance			$ 113.36
Weighted-Average Grant Date Fair Value, Expired			118.37
Weighted-Average Grant Date Fair Value, Ending balance	$ 107.81		$ 107.81
Weighted-average contractual remaining life (in years)			9 months 7 days
Exercisable shares	2,919		2,919
Weighted-average exercise price			$ 107.81
Weighted-average exercise price exercisable shares	$ 107.81		$ 107.81
Compensation expense (credit)	$ 5,000	$ 98,000	$ (44,000)	$ 135,000
Fair value of liability award	$ 34,000		$ 34,000		$ 213,000
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, Shares			76,000
Exercised, Shares			(2,000)
Ending balance, Shares	74,000		74,000
Weighted-Average Grant Date Fair Value, Beginning balance			$ 110.73
Weighted-Average Grant Date Fair Value, Exercised			130.52
Weighted-Average Grant Date Fair Value, Ending balance	$ 110.19		$ 110.19
Weighted-average contractual remaining life (in years)			3 years 4 days
Weighted-average exercise price			$ 110.19
Compensation expense (credit)	$ 206,000	212,000	$ 618,000	631,000
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, Shares			100,445
Granted, Shares			16,500
Exercised, Shares			(62,079)
Forfeited, Shares			(2,069)
Ending balance, Shares	52,797		52,797
Weighted-Average Grant Date Fair Value, Beginning balance			$ 105.97
Weighted-Average Grant Date Fair Value, Granted			117.89
Weighted-Average Grant Date Fair Value, Exercised			108.91
Weighted-Average Grant Date Fair Value, Forfeited			104.17
Weighted-Average Grant Date Fair Value, Ending balance	$ 106.26		$ 106.26
Weighted-average contractual remaining life (in years)			10 months 25 days
Weighted-average exercise price			$ 106.26
Compensation expense (credit)	$ 565,000	$ 1,297,000	$ 2,214,000	$ 5,744,000
Fair value of liability award	$ 6,479,000		$ 6,479,000		$ 13,197,000

Stockholders' Equity and Nonc83

Stockholders' Equity and Noncontrolling Interests - Summary of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Weighted average shares outstanding	26,894,538	26,908,032	26,895,952	26,908,619
Incremental shares from RS awards and RSUs	64,126	59,299	63,275	57,768
Total shares for diluted calculations	26,958,664	26,967,331	26,959,227	26,966,387
Net income attributable to American National (in thousands)	$ 73,269	$ 59,289	$ 149,068	$ 121,230
Basic earnings per share	$ 2.72	$ 2.20	$ 5.54	$ 4.51
Diluted earnings per share	$ 2.72	$ 2.20	$ 5.53	$ 4.50

Stockholders' Equity and Nonc84

Stockholders' Equity and Noncontrolling Interests - Statutory Capital and Surplus and Net Income of Insurance Entities in Accordance with Statutory Accounting Practices (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Life [Member]
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	$ 1,978,684		$ 1,978,684		$ 1,921,171
Statutory net income	9,674	$ 22,226	28,016	$ 45,335
Property and Casualty [Member]
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	1,102,644		1,102,644		$ 1,074,525
Statutory net income	$ 20,096	$ 11,417	$ 21,268	$ 14,674

Segment Information - Additiona

Segment Information - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017Segment
Segment Reporting [Abstract]
Segment information, number of operating segments	5

Segment Information - Summary o

Segment Information - Summary of Results of Operations Measured as Income Before Federal Income Taxes and Equity in Earnings of Unconsolidated Affiliates by Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	$ 90,567	$ 47,722	$ 167,231	$ 111,510
Life [Member]
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	15,647	9,547	30,950	22,832
Annuity [Member]
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	15,014	13,567	56,638	49,001
Accident and Health [Member]
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	3,714	(6,487)	9,263	(2,702)
Property and Casualty [Member]
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	15,431	663	8,587	2,878
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	$ 40,761	$ 30,432	$ 61,793	$ 39,501

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments outstanding, aggregate amount	$ 827,681,000
Commitments expected to be funded in 2017	250,638,000
Short-term borrowing facility, maximum capacity	100,000,000
Short-term borrowing facility, letters of credit	55,000,000
Letters of credit outstanding, amount	$ 11,087,000	$ 9,473,000
Short-term borrowing facility, expiration date	Oct. 30, 2017
Total amount of guarantees outstanding	$ 206,376,000
Life insurance policies with guarantees, cash value	$ 208,361,000

Related Party Transactions - Re

Related Party Transactions - Related Party Transactions (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Gal-Tex Hotel Corporation [Member] | Mortgage Loan On Real Estate Income Statement Effect [Member]
Related Party Transaction [Line Items]
Dollar amount of transactions	$ 1,139	$ 1,060
Gal-Tex Hotel Corporation [Member] | Net Investment Income [Member]
Related Party Transaction [Line Items]
Dollar amount of transactions	177	256
Gal-Tex Hotel Corporation [Member] | Mortgage Loans On Real Estate Financial Statement Caption [Member]
Related Party Transaction [Line Items]
Amount due to (from) American National	2,617		$ 3,756
Gal-Tex Hotel Corporation [Member] | Net Investment Income Accrual [Member]
Related Party Transaction [Line Items]
Amount due to (from) American National	16		23
Greer, Herz & Adams, LLP [Member] | Other Operating Expenses [Member]
Related Party Transaction [Line Items]
Dollar amount of transactions	8,072	$ 7,610
Greer, Herz & Adams, LLP [Member] | Other Operating Expenses Accrual [Member]
Related Party Transaction [Line Items]
Amount due to (from) American National	$ (374)		$ (283)

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - Gal-Tex Hotel Corporation [Member]	9 Months Ended
	Sep. 30, 2017
Related Party Transaction [Line Items]
Interest rate on mortgage loans	7.25%
Due date of mortgage loans receivable	Apr. 1, 2019