Reconciliation of Weighted Average Shares Used in Calculating Basic and Diluted Earnings Per Share (Detail) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share Disclosure [Line Items]
Basic	56,281	69,689	73,111
Effect of exercise of stock options	1,137	987	1,148
Effect of contingent common stock issuance		36	36
Effect of assumed vesting of performance related restricted stock-based awards	199
Effect of assumed vesting of restricted stock	1,432	1,245	1,200
Effect of convertible notes subject to conversion	1,685
Diluted	60,734	71,957	75,495