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Earnings Per Share - Schedule of Computation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, 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
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  | $ 96,965 us-gaap_NetIncomeLoss | $ 77,130 us-gaap_NetIncomeLoss | $ 37,773 us-gaap_NetIncomeLoss
Noncontrolling interests |  |  |  |  |  |  |  |  | 735 us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity | (1,940)us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity | (101)us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity
Allocation of earnings to preferred stockholders |  |  |  |  |  |  |  |  | 0 us-gaap_PreferredStockDividendsAndOtherAdjustments |  | (64)us-gaap_PreferredStockDividendsAndOtherAdjustments
Net Income Attributable to Common Stockholders | $ 18,879 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 37,340 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 19,543 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 21,938 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 24,756 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 21,089 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 15,385 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 13,960 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 97,700 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 75,190 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 37,608 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Shares: |  |  |  |  |  |  |  |  |  |  |
Basic: Weighted-average number of shares outstanding |  |  |  |  |  |  |  |  | 9,091 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 8,188 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 7,727 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Plus: Incremental shares from assumed conversion of dilutive instruments |  |  |  |  |  |  |  |  | 201 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 245 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 346 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted: Weighted-average number of shares outstanding |  |  |  |  |  |  |  |  | 9,292 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 8,433 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 8,073 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings per share-Basic | $ 2.09 us-gaap_EarningsPerShareBasic | $ 4.10 us-gaap_EarningsPerShareBasic | $ 2.14 us-gaap_EarningsPerShareBasic | $ 2.41 us-gaap_EarningsPerShareBasic | $ 2.72 us-gaap_EarningsPerShareBasic | $ 2.64 us-gaap_EarningsPerShareBasic | $ 1.97 us-gaap_EarningsPerShareBasic | $ 1.79 us-gaap_EarningsPerShareBasic | $ 10.75 us-gaap_EarningsPerShareBasic | $ 9.18 us-gaap_EarningsPerShareBasic | $ 4.87 us-gaap_EarningsPerShareBasic
Earnings per share-Diluted | $ 2.05 us-gaap_EarningsPerShareDiluted | $ 4.02 us-gaap_EarningsPerShareDiluted | $ 2.10 us-gaap_EarningsPerShareDiluted | $ 2.34 us-gaap_EarningsPerShareDiluted | $ 2.65 us-gaap_EarningsPerShareDiluted | $ 2.56 us-gaap_EarningsPerShareDiluted | $ 1.91 us-gaap_EarningsPerShareDiluted | $ 1.73 us-gaap_EarningsPerShareDiluted | $ 10.51 us-gaap_EarningsPerShareDiluted | $ 8.92 us-gaap_EarningsPerShareDiluted | $ 4.66 us-gaap_EarningsPerShareDiluted

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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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 3: 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=32703322&loc=d3e4984-109258 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=26872669&loc=d3e20235-122688 Reference 5: 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 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 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units 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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: 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=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 5: 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 + Details
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