XML 67 R50.htm IDEA: XBRL DOCUMENT v3.8.0.1
Dividends Declared (Detail) - Dividend Declared - $ / shares
 1 Months Ended
Dec. 31, 2017
Nov. 30, 2017
Oct. 31, 2017
Sep. 30, 2017
Aug. 31, 2017
Jul. 31, 2017
Jun. 30, 2017
May 31, 2017
Apr. 30, 2017
Mar. 31, 2017
Feb. 28, 2017
Jan. 31, 2017
Dec. 31, 2016
Nov. 30, 2016
Oct. 31, 2016
Sep. 30, 2016
Aug. 31, 2016
Jul. 31, 2016
Jun. 30, 2016
May 31, 2016
Apr. 30, 2016
Mar. 31, 2016
Feb. 29, 2016
Jan. 31, 2016
Dividends Payable [Line Items]                                                
Declaration Date Oct. 12, 2017 Oct. 12, 2017 Oct. 12, 2017 Jul. 14, 2017 Jul. 14, 2017 Jul. 14, 2017 Apr. 12, 2017 Apr. 12, 2017 Apr. 12, 2017 Jan. 12, 2017 Jan. 12, 2017 Jan. 12, 2017 Oct. 12, 2016 Oct. 12, 2016 Oct. 12, 2016 Jul. 14, 2016 Jul. 14, 2016 Jul. 14, 2016 Apr. 14, 2016 Apr. 14, 2016 Apr. 14, 2016 Jan. 14, 2016 Jan. 14, 2016 Jan. 14, 2016
Record Date Dec. 29, 2017 Nov. 30, 2017 Oct. 31, 2017 Sep. 29, 2017 Aug. 31, 2017 Jul. 31, 2017 Jun. 30, 2017 May 31, 2017 Apr. 28, 2017 Mar. 31, 2017 Feb. 28, 2017 Jan. 31, 2017 Dec. 30, 2016 Nov. 30, 2016 Oct. 31, 2016 Sep. 30, 2016 Aug. 31, 2016 Jul. 29, 2016 Jun. 30, 2016 May 31, 2016 Apr. 29, 2016 Mar. 31, 2016 Feb. 29, 2016 Jan. 29, 2016
Payment Date Jan. 15, 2018 Dec. 15, 2017 Nov. 15, 2017 Oct. 13, 2017 Sep. 15, 2017 Aug. 15, 2017 Jul. 17, 2017 Jun. 15, 2017 May 15, 2017 Apr. 17, 2017 Mar. 15, 2017 Feb. 15, 2017 Jan. 17, 2017 Dec. 15, 2016 Nov. 15, 2016 Oct. 17, 2016 Sep. 15, 2016 Aug. 15, 2016 Jul. 15, 2016 Jun. 15, 2016 May 16, 2016 Apr. 15, 2016 Mar. 15, 2016 Feb. 16, 2016
Dividend Declared Per Share $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06
Noncontrolling Interests                                                
Dividends Payable [Line Items]                                                
Declaration Date Oct. 12, 2017 Oct. 12, 2017 Oct. 12, 2017 Jul. 14, 2017 Jul. 14, 2017 Jul. 14, 2017 Apr. 12, 2017 Apr. 12, 2017 Apr. 12, 2017 Jan. 12, 2017 Jan. 12, 2017 Jan. 12, 2017 Oct. 12, 2016 Oct. 12, 2016 Oct. 12, 2016 Jul. 14, 2016 Jul. 14, 2016 Jul. 14, 2016 Apr. 14, 2016 Apr. 14, 2016 Apr. 14, 2016 Jan. 14, 2016 Jan. 14, 2016 Jan. 14, 2016
Record Date Dec. 29, 2017 Nov. 30, 2017 Oct. 31, 2017 Sep. 29, 2017 Aug. 31, 2017 Jul. 31, 2017 Jun. 30, 2017 May 31, 2017 Apr. 28, 2017 Mar. 31, 2017 Feb. 28, 2017 Jan. 31, 2017 Dec. 30, 2016 Nov. 30, 2016 Oct. 31, 2016 Sep. 30, 2016 Aug. 31, 2016 Jul. 29, 2016 Jun. 30, 2016 May 31, 2016 Apr. 29, 2016 Mar. 31, 2016 Feb. 29, 2016 Jan. 29, 2016
Payment Date Jan. 15, 2018 Dec. 15, 2017 Nov. 15, 2017 Oct. 13, 2017 Sep. 15, 2017 Aug. 15, 2017 Jul. 17, 2017 Jun. 15, 2017 May 15, 2017 Apr. 17, 2017 Mar. 15, 2017 Feb. 15, 2017 Jan. 17, 2017 Dec. 15, 2016 Nov. 15, 2016 Oct. 17, 2016 Sep. 15, 2016 Aug. 15, 2016 Jul. 15, 2016 Jun. 15, 2016 May 16, 2016 Apr. 15, 2016 Mar. 15, 2016 Feb. 16, 2016
Dividend Declared Per Share $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06