Stock-Based Compensation Plans - PSUA Activity (Parenthetical) (Detail)	3 Months Ended
	Mar. 31, 2014
Minimum
Schedule Of Weighted Average Assumptions For Fair Values Of Stock Options [Line Items]
Actual payout of shares on performance units granted	0.00%
Maximum
Schedule Of Weighted Average Assumptions For Fair Values Of Stock Options [Line Items]
Actual payout of shares on performance units granted	150.00%