Cash Dividends (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Dividends Payable [Line Items]
Cash dividends paid, per share	$ 0.10	$ 0.10
Cash dividends paid	$ 14,712
Installment 1, FY 2015
Dividends Payable [Line Items]
Cash dividends paid, date		Mar. 25, 2015
Cash dividends paid, per share		$ 0.10
Cash dividends paid		$ 14,640
Installment 1, FY 2016
Dividends Payable [Line Items]
Cash dividends paid, date	Mar. 24, 2016
Cash dividends paid, per share	$ 0.10
Cash dividends paid	$ 14,712