Capital Stock (Detail)	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Stockholders' Equity Note [Abstract]
Beginning balance	163,342,894	162,514,098
Public offering	4,560,000
SARs exercised	188,305	278,916
Restricted stock granted	266,453	401,122
Restricted stock units vested	237,620	119,480
Treasury shares issued	15,336	29,278
Ending balance	168,610,608	163,342,894