Earnings Per Common Share Basic and Diluted (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Numerator-basic and diluted
Net income	$ 23,680	$ 18,431
Denominator
Weighted average number of common shares outstanding-basic	39,403	40,358
Effect of dilutive stock options	595	963
Effect of dilutive convertible notes		1,159
Effect of dilutive restricted shares	622	705
Weighted average number of common shares outstanding-diluted	40,620	43,185
Earnings per common share-basic	$ 0.60	$ 0.46
Earnings per common share-diluted	$ 0.58	$ 0.43
Antidilutive stock options and restricted shares	3,486	2,081

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration