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Ownership, Description of Business, and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May. 31, 2015 | May. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Aug. 12, 2015 | May. 06, 2014 | Apr. 24, 2014 | Mar. 05, 2014 | Jun. 24, 2013 | Nov. 27, 2012
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |  |  |  |
Foreclosure rate (less than) |  |  | 0.50% |  |  |  |  |  |  |  |
Deferred Court Costs not recovered, years |  |  | 5 years |  |  |  |  |  |  |  |
Receivables secured by property tax liens on non-accrual basis |  |  | $ 700,000 | $ 0 |  |  |  |  |  |  |
Receivables secured by tax lien, redemption period (less than) |  |  | 84 months |  |  |  |  |  |  |  |
Receivables secured by property tax liens, net |  |  | $ 306,380,000 | 259,432,000 |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  | $ 50,000,000.0 |  | $ 50,000,000.0 |  |  |
Stock repurchased during period (in shares) | 839,295 | 400,000 |  |  |  |  |  |  |  |  |
Stock repurchased during period (amount) | $ 33,200,000 | $ 16,800,000 | $ 33,185,000 | $ 16,815,000 | $ 729,000 |  |  |  |  |  |
Employee stock options to purchase common shares, excluded from computation of diluted earnings per share |  |  | 0 | 0 | 0 |  |  |  |  |  |
2017 Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  | 3.00% |  |  |  |  |  |  |  |
Convertible debt |  |  | $ 115,000,000 |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) |  |  | $ 31.56 |  |  |  |  |  |  |  | $ 31.56
2017 Convertible Senior Notes [Member] | Adjusted Debt Conversion Rate Following Hedge Transactions [Member] |  |  |  |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) |  |  | $ 60.00 |  |  |  |  |  |  |  |
2020 Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  | 3.00% |  |  |  |  |  |  |  |
Convertible debt |  |  | $ 172,500,000 |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) |  |  | $ 45.72 |  |  |  |  |  |  | $ 45.72 |
2020 Convertible Senior Notes [Member] | Adjusted Debt Conversion Rate Following Hedge Transactions [Member] |  |  |  |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) |  |  | $ 61.55 |  |  |  |  |  |  |  |
2021 Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  | 2.875% |  |  |  |  |  |  |  |
Convertible debt |  |  | $ 161,000,000 |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) |  |  | $ 59.39 |  |  |  |  |  | $ 59.39 |  |
2021 Convertible Senior Notes [Member] | Adjusted Debt Conversion Rate Following Hedge Transactions [Member] |  |  |  |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) |  |  | $ 83.14 |  |  |  |  |  |  |  |
Texas [Member] |  |  |  |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |  |  |  |
Receivables secured by property tax liens, net |  |  |  |  |  |  | $ 141,500,000 |  |  |  |
Receivables secured by property tax liens, principal balance |  |  |  |  |  |  | $ 134,000,000 |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  | 1.44% |  |  |  |
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] |  |  |  |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |  |  |  |
Receivables secured by property tax liens, net |  |  | $ 81,149,000 | $ 108,535,000 |  |  |  |  |  |  |

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