Schedule I - Dividends from Subsidiaries - Schedule of SEA Paid a Cash Dividend to Parent Related to Dividend Declarations (Detail) - USD ($) $ in Thousands					12 Months Ended
	Sep. 16, 2015	Jun. 10, 2015	Mar. 03, 2015	Jan. 05, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Dividends Payable [Line Items]
Cash dividends payable date	Oct. 06, 2015	Jul. 01, 2015	Apr. 01, 2015	Jan. 22, 2015
Q4 2014 Declaration [Member]
Dividends Payable [Line Items]
Cash dividends payable date					Jan. 22, 2015
Q1 2015 Declaration [Member]
Dividends Payable [Line Items]
Cash dividends payable date					Apr. 01, 2015
Q2 2015 Declaration [Member]
Dividends Payable [Line Items]
Cash dividends payable date					Jul. 01, 2015
Q3 2015 Declaration [Member]
Dividends Payable [Line Items]
Cash dividends payable date					Oct. 06, 2015
Q4 2013 Declaration [Member]
Dividends Payable [Line Items]
Cash dividends payable date					Jan. 03, 2014		Jan. 03, 2014
Q1 2014 Declaration [Member]
Dividends Payable [Line Items]
Cash dividends payable date					Apr. 01, 2014	Apr. 01, 2014
Q2 2014 Declaration [Member]
Dividends Payable [Line Items]
Cash dividends payable date					Jul. 01, 2014	Jul. 01, 2014
Q3 2014 Declaration [Member]
Dividends Payable [Line Items]
Cash dividends payable date					Oct. 06, 2014	Oct. 06, 2014
Q2 2013 Declaration [Member]
Dividends Payable [Line Items]
Cash dividends payable date					Jul. 01, 2013		Jul. 01, 2013
Q3 2013 Declaration [Member]
Dividends Payable [Line Items]
Cash dividends payable date					Oct. 01, 2013		Oct. 01, 2013
Parent Company [Member] | Q4 2014 Declaration [Member]
Dividends Payable [Line Items]
Cash dividends payable date					Jan. 22, 2015
Cash dividends paid					$ 18,112
Parent Company [Member] | Q1 2015 Declaration [Member]
Dividends Payable [Line Items]
Cash dividends payable date					Apr. 01, 2015
Cash dividends paid					$ 18,204
Parent Company [Member] | Q2 2015 Declaration [Member]
Dividends Payable [Line Items]
Cash dividends payable date					Jul. 01, 2015
Cash dividends paid					$ 18,238
Parent Company [Member] | Q3 2015 Declaration [Member]
Dividends Payable [Line Items]
Cash dividends payable date					Oct. 06, 2015
Cash dividends paid					$ 18,117
Parent Company [Member] | Q4 2013 Declaration [Member]
Dividends Payable [Line Items]
Cash dividends payable date						Jan. 03, 2014	Jan. 03, 2014
Cash dividends paid						$ 17,767
Parent Company [Member] | Q1 2014 Declaration [Member]
Dividends Payable [Line Items]
Cash dividends payable date						Apr. 01, 2014
Cash dividends paid						$ 17,766
Parent Company [Member] | Q2 2014 Declaration [Member]
Dividends Payable [Line Items]
Cash dividends payable date						Jul. 01, 2014
Cash dividends paid						$ 18,290
Parent Company [Member] | Q3 2014 Declaration [Member]
Dividends Payable [Line Items]
Cash dividends payable date						Oct. 06, 2014
Cash dividends paid						$ 18,290
Parent Company [Member] | Q2 2013 Declaration [Member]
Dividends Payable [Line Items]
Cash dividends payable date							Jul. 01, 2013
Cash dividends paid							$ 18,072
Parent Company [Member] | Q3 2013 Declaration [Member]
Dividends Payable [Line Items]
Cash dividends payable date							Oct. 01, 2013
Cash dividends paid							$ 18,072