Schedule II - Condensed Statements Of Cash Flows Parent Company (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from investing activities:
Net cash effect of acquisitions/dispositions	$ (163,320)	$ (5,837)	$ (32,476)
Proceeds from sales of equity securities	928,386	621,255	954,626
Net change in other long-term investments	8,025	6,443	6,591
Cash flows from financing activities:
Net proceeds from issuance of debt	594,477	249,144	440,065
Repayment of debt	(325,110)us-gaap_RepaymentsOfLongTermDebt	(168,205)us-gaap_RepaymentsOfLongTermDebt	(510,544)us-gaap_RepaymentsOfLongTermDebt
Excess tax benefits from share-based compensation	6,856	6,202	2,372
Net proceeds in connection with share-based compensation plans	3,601	1,736	12,668
Purchase of Company shares		(64,606)
Cash dividends	(89,939)us-gaap_PaymentsOfDividends	(51,324)us-gaap_PaymentsOfDividends	(44,705)us-gaap_PaymentsOfDividends
Net increase in cash and cash equivalents	355,243	164,308	225,836
Cash and cash equivalents—Beginning of year	834,837	670,529	444,693
Cash and cash equivalents—End of year	1,190,080	834,837	670,529
Parent Company
Cash flows from operating activities:
Cash provided by (used for) operating activities	54,298	71,326	(38,703)
Cash flows from investing activities:
Net cash effect of acquisitions/dispositions	(151,570)
Proceeds from sales of equity securities			137,823
Contributions to subsidiaries	(11,396)	(800)	(10,999)
Net change in other long-term investments	1,490	6,549	595
Cash (used for) provided by investing activities	(161,476)	5,749	127,419
Cash flows from financing activities:
Net proceeds from issuance of debt	593,943	249,095	440,000
Repayment of debt	(300,000)	(160,000)	(480,000)
Repayment of debt to subsidiaries			(2,902)
Excess tax benefits from share-based compensation	6,856	6,202	2,372
Net proceeds in connection with share-based compensation plans	3,601	1,736	12,668
Purchase of Company shares		(64,606)
Cash dividends	(89,939)	(51,324)	(44,705)
Cash provided by (used for) financing activities	214,461	(18,897)	(72,567)
Net increase in cash and cash equivalents	107,283	58,178	16,149
Cash and cash equivalents—Beginning of year	221,666	163,488	147,339
Cash and cash equivalents—End of year	$ 328,949	$ 221,666	$ 163,488

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