Income (Loss) Per Common Share - Basic Weighted Average Common Shares Outstanding to Diluted Weighted Average Common Shares Outstanding (Detail) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Denominator:
Weighted average common shares outstanding – basic	161,909	160,565	161,354	160,346
Effect of dilutive securities:
Director and employee stock options and SARs	904	849	969	877
Weighted average common shares outstanding – diluted	162,813	161,414	162,323	161,223