Capital Stock (Narrative) (Detail) - $ / shares shares in Thousands	Feb. 01, 2018	Dec. 07, 2017	Aug. 24, 2017	Dec. 31, 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	$ 0.065
Dividends declared, date of declaration		Dec. 07, 2017	Aug. 24, 2017
Dividend paid, date		Dec. 28, 2017	Sep. 21, 2017
Dividends declared, date of record		Dec. 18, 2017	Sep. 08, 2017
Subsequent event
Dividends Payable [Line Items]
Dividends declared, per share amount	$ 0.065
Dividends declared, date of declaration	Feb. 01, 2018
Dividends payable, date to be paid	Mar. 23, 2018
Dividends declared, date of record	Mar. 09, 2018
Stock repurchase program
Dividends Payable [Line Items]
Number of shares authorized to be repurchased						5,000