Shareholders' Equity - Summary of Cash Dividends Declared on Common Stock (Detail) - $ / shares			12 Months Ended
	Oct. 20, 2015	Jun. 16, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Dividends Payable [Line Items]
Date declared			Feb. 10, 2016
Record date			Feb. 22, 2016
Payable date			Mar. 04, 2016
Cash dividends declared per common share			$ 0.40	$ 0	$ 0
Installment 1-FY 2015 [Member]
Dividends Payable [Line Items]
Date declared			Oct. 20, 2015
Record date			Nov. 02, 2015
Payable date			Nov. 27, 2015
Cash dividends declared per common share	$ 0.20
Installment 2-FY 2015 [Member]
Dividends Payable [Line Items]
Date declared			Jun. 16, 2015
Record date			Jul. 31, 2015
Payable date			Aug. 28, 2015
Cash dividends declared per common share		$ 0.20