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Schedule of Basic Weighted Average Shares Reconciles to Diluted Weighted Average Shares Outstanding (Detail) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic weighted average common shares outstanding | 78,669 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 79,558 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 80,106 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 80,527 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 80,782 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 81,259 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 81,829 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 82,197 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 79,715 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 81,517 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 82,689 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of stock options, unvested shares, performance share units and DCUs |  |  |  |  |  |  |  |  | 1,013 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 972 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 952 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted weighted average common shares outstanding | 79,632 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 80,561 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 81,149 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 81,575 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 81,854 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 82,218 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 82,734 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 83,152 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 80,728 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 82,489 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 83,641 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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