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Cash Dividends (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Dividends Payable [Line Items]
Cash dividends paid, per share	$ 0.16	$ 0.40	$ 0.40
Cash dividends paid	$ 23,579	$ 58,775	$ 58,288
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
Installment 4, FY 2016
Dividends Payable [Line Items]
Cash dividends paid, date	Dec. 22, 2016
Cash dividends paid, per share	$ 0.02
Cash dividends paid	$ 2,961
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 2, FY 2015
Dividends Payable [Line Items]
Cash dividends paid, date		Jun. 24, 2015
Cash dividends paid, per share		$ 0.10
Cash dividends paid		$ 14,712
Installment 3, FY 2015
Dividends Payable [Line Items]
Cash dividends paid, date		Sep. 24, 2015
Cash dividends paid, per share		$ 0.10
Cash dividends paid		$ 14,712
Installment 4, FY 2015
Dividends Payable [Line Items]
Cash dividends paid, date		Dec. 24, 2015
Cash dividends paid, per share		$ 0.10
Cash dividends paid		$ 14,711
Installment 1, FY 2014
Dividends Payable [Line Items]
Cash dividends paid, date			Mar. 27, 2014
Cash dividends paid, per share			$ 0.10
Cash dividends paid			$ 14,456
Installment 2, FY 2014
Dividends Payable [Line Items]
Cash dividends paid, date			Jun. 26, 2014
Cash dividends paid, per share			$ 0.10
Cash dividends paid			$ 14,562
Installment 3, FY 2014
Dividends Payable [Line Items]
Cash dividends paid, date			Sep. 24, 2014
Cash dividends paid, per share			$ 0.10
Cash dividends paid			$ 14,634
Installment 4, FY 2014
Dividends Payable [Line Items]
Cash dividends paid, date			Dec. 24, 2014
Cash dividends paid, per share			$ 0.10
Cash dividends paid			$ 14,636

X

- Definition

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

+ References

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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- Definition

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=6367179&loc=d3e4304-108586

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- Definition

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

+ References

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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