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Shares Repurchased - Additional Information (Detail) (Three-Year Share Repurchase Program [Member], USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Oct. 29, 2014
Common stock purchase authorized amount			$ 100,000,000
Repurchased common stock, shares	773
Repurchased common stock, shares	14,070,000
Repurchased shares, remaining for future purchases	85,930,000
Tax Withholding Obligations [Member]
Repurchased common stock, shares	259	312
Repurchased common stock, shares	4,385,000	5,426,000
Employee Equity Grants [Member]
Repurchased common stock, shares	514
Repurchased common stock, shares	$ 9,685,000