Earnings (Loss) Per Share - Computation of Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Weighted average shares:
Weighted average common shares outstanding	50,693	51,566	53,854
Effect of dilutive securities outstanding	370	277	337
Diluted weighted average shares outstanding	51,063	51,843	54,191
Earnings (loss):
Income from continuing operations	$ 134,225	$ 121,897	$ 130,343
Income (loss) from discontinued operations	133	1,007	44,300
Net income	$ 134,358	$ 122,904	$ 174,643
Basic per share amounts:
Income from continuing operations	$ 2.65	$ 2.36	$ 2.42
Income (loss) from discontinued operations	$ 0.00	$ 0.02	$ 0.82
Net Income	$ 2.65	$ 2.38	$ 3.24
Diluted per share amounts:
Income from continuing operations	$ 2.63	$ 2.35	$ 2.40
Income (loss) from discontinued operations	$ 0.00	$ 0.02	$ 0.82
Net Income	$ 2.63	$ 2.37	$ 3.22