Notes Payable, Other and Short-Term Borrowings - Carrying Amounts and Estimated Fair Values of Company's Senior Notes (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Carrying amount of the Company's long-term debt	$ 1,041,550	$ 1,040,064
Estimated fair value of the Company's long-term debt	1,071,450	1,093,799
5.125% Senior Notes [Member]
Debt Instrument [Line Items]
Carrying amount of the Company's long-term debt	299,141	298,688
Estimated fair value of the Company's long-term debt	304,500	311,100
5.375% Senior Notes [Member]
Debt Instrument [Line Items]
Carrying amount of the Company's long-term debt	445,914	445,247
Estimated fair value of the Company's long-term debt	471,150	482,099
3.750% Senior Notes [Member]
Debt Instrument [Line Items]
Carrying amount of the Company's long-term debt	296,495	296,129
Estimated fair value of the Company's long-term debt	$ 295,800	$ 300,600