Aggregate dividends paid during the period for each share of common stock outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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Cash Dividends (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Dividends Payable [Line Items]
Cash dividends paid, per share	$ 0.02	$ 0.02	$ 0.06	$ 0.14
Cash dividends paid			$ 11,866	$ 20,618
Installment 1, FY 2017
Dividends Payable [Line Items]
Cash dividends paid, date			Mar. 22, 2017
Cash dividends paid, per share			$ 0.02
Cash dividends paid			$ 3,326
Installment 2, FY 2017
Dividends Payable [Line Items]
Cash dividends paid, date			Jun. 22, 2017
Cash dividends paid, per share			$ 0.02
Cash dividends paid			$ 4,269
Installment 3, FY 2017
Dividends Payable [Line Items]
Cash dividends paid, date			Sep. 21, 2017
Cash dividends paid, per share			$ 0.02
Cash dividends paid			$ 4,271
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
Installment 2, FY 2016
Dividends Payable [Line Items]
Cash dividends paid, date				Jun. 23, 2016
Cash dividends paid, per share				$ 0.02
Cash dividends paid				$ 2,953
Installment 3, FY 2016
Dividends Payable [Line Items]
Cash dividends paid, date				Sep. 22, 2016
Cash dividends paid, per share				$ 0.02
Cash dividends paid				$ 2,953