Capital Stock (Narrative) (Detail) - $ / shares shares in Thousands	1 Months Ended
	Aug. 24, 2017	Sep. 30, 2017	Jun. 30, 2017	May 04, 2017
Dividends Payable [Line Items]
Common stock, shares authorized		75,000	75,000
Preferred stock, shares authorized		2,000	2,000
Dividends declared, per share amount	$ 0.065
Dividends declared, date of declaration	Aug. 24, 2017
Dividend paid, date	Sep. 21, 2017
Dividends declared, date of record	Sep. 08, 2017
Stock repurchase program
Dividends Payable [Line Items]
Number of shares authorized to be repurchased				5,000