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Per Share Information - Basic and Diluted Earnings Per Share (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Amounts attributable to common stock: |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations | $ 113,561 | $ 89,313 | $ 63,837 | $ 48,267 | $ 88,530 | $ 73,137 | $ 16,562 | $ 20,496 | $ 314,978 | $ 198,725 | $ 120,286
Net income (loss) from discontinued operations |  |  |  |  |  |  |  |  | 0 | (342) | 190,621
Net income attributable to common stock | $ 113,561 | $ 89,313 | $ 63,837 | $ 48,267 | $ 87,583 | $ 73,742 | $ 16,562 | $ 20,496 | $ 314,978 | $ 198,383 | $ 310,907
Weighted average shares: |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding for basic earnings per share attributable to common stock (in shares) |  |  |  |  |  |  |  |  | 156,124,000 | 157,287,000 | 195,113,000
Effect of dilutive unvested non-participating stock-based awards (in shares) |  |  |  |  |  |  |  |  | 1,031,000 | 1,000 | 7,000
Weighted average shares outstanding for diluted earnings per share attributable to common stock (in shares) |  |  |  |  |  |  |  |  | 157,155,000 | 157,288,000 | 195,120,000
Number of shares of Common stock received for each exchangeable share (in shares) |  |  |  |  |  |  |  |  | 1 |  |

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- Definition Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5C -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721675-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(12)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e1012-107759 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3B -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721525-107759 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721523-107759 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e957-107759 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 + Details
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