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Reconciliation of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 6,519 |  | $ 1,156 |  | $ 19,521 |  | $ 4,245 |  | $ (42,706) |  | $ 2,407 |  | $ 30,790 |  | $ (46) | $ 31,441 | $ (9,555) | $ 30,156
(Income) loss allocated to non-controlling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,235) | (246) | (1,914)
Net income (loss) allocable to common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,206 | $ (9,801) | $ 28,242
Weighted-average shares outstanding—Basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 73,338,219 | 52,182,427 | 36,153,673
Dilutive securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 261,650 |  | 6,601
Weighted-average shares outstanding—Diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 73,599,869 | 52,182,427 | 36,160,274
Basic | $ 0.08 | [1] | $ 0.02 | [1] | $ 0.27 | [1] | $ 0.06 | [1] | $ (0.61) | [1] | $ 0.05 | [1] | $ 0.61 | [1] |  | $ 0.41 | $ (0.19) | $ 0.78
Diluted | $ 0.08 | [1] | $ 0.02 | [1] | $ 0.27 | [1] | $ 0.06 | [1] | $ (0.61) | [1] | $ 0.05 | [1] | $ 0.61 | [1] |  | $ 0.41 | $ (0.19) | $ 0.78
[1] | The summation of quarterly per share amounts do not equal the full year amounts.

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting 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 -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 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258 Reference 3: 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(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 5: 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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