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Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consolidated net income | $ 39,767 | $ 42,106 | $ 36,826 | $ 31,813 | $ 34,262 | $ 30,276 | $ 30,040 | $ 43,890 | $ 150,512 | $ 138,468 | $ 77,247
Total revenues | 201,616 | 210,144 | 201,480 | 208,414 | 190,261 | 200,778 | 189,025 | 196,745 | 821,654 | 776,809 | 729,048
Income from operations | 72,617 | 72,512 | 68,097 | 82,014 | 68,153 | 67,545 | 62,770 | 73,730 |  |  |
Net income available for Common Stockholders | $ 34,501 | $ 36,673 | $ 31,786 | $ 27,185 | $ 29,403 | $ 25,746 | $ 25,483 | $ 38,099 | $ 150,512 | $ 138,468 | $ 125,905
Weighted average Common Stockholders outstanding—basic | 84,072 | 84,057 | 84,031 | 83,961 | 83,562 | 83,531 | 83,234 | 83,116 | 84,031 | 83,362 | 83,018
Weighted average Common Shares outstanding—Diluted | 91,875 | 91,940 | 91,851 | 91,777 | 91,644 | 91,528 | 91,420 | 91,353 | 91,907 | 91,511 | 91,196
Net income per Common Share outstanding—Basic | $ 0.41 | $ 0.44 | $ 0.38 | $ 0.32 | $ 0.35 | $ 0.31 | $ 0.31 | $ 0.46 | $ 1.55 | $ 1.42 | $ 1.29
Net income per Common Share outstanding—Diluted | $ 0.41 | $ 0.43 | $ 0.38 | $ 0.32 | $ 0.35 | $ 0.31 | $ 0.30 | $ 0.46 | $ 1.54 | $ 1.41 | $ 1.28

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