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Summarizes Stock Appreciation Rights (SARs) Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock Options Outstanding, beginning balance, Shares | 1,674,534 | 1,943,176 | 2,129,929
Granted, Shares | 524,534 | 605,000 | 510,000
Exercised, Shares | (571,723) | (731,142) | (672,753)
Forfeited, Shares | (96,500) | (142,500) | (24,000)
Stock Options Outstanding, ending balance, Shares | 1,530,845 | 1,674,534 | 1,943,176
Exercisable, Ending Balance | 439,561 | 632,034 | 1,055,176
Stock Options Outstanding, beginning balance, Weighted-Average Exercise Price | $ 19.14 | $ 12.19 | $ 8.82
Granted, Weighted-Average Exercise Price | 41.97 | 30.15 | 19.64
Exercised, Weighted-Average Exercise Price | 16.21 | 9.84 | 7.21
Forfeited, Weighted-Average Exercise Price | 28.47 | 18.94 | 11.27
Stock Options Outstanding, ending balance, Weighted-Average Exercise Price | 27.46 | 19.14 | 12.19
Exercisable, Weighted Average Exercise Price | $ 12.18 | $ 10.13 | $ 12.21
Stock Options Outstanding, Weighted-Average Remaining Contractual Term | 4 years 11 months 19 days | 5 years 1 month 6 days | 5 years 3 months 22 days
Exercisable, Weighted-Average Remaining Contractual Term | 3 years 6 months 4 days | 3 years 11 months 19 days | 4 years 6 months 29 days
Outstanding, Aggregate Intrinsic Value | $ 30,573 | $ 29,886 | $ 28,379
Exercisable, Aggregate Intrinsic Value | $ 15,480 | $ 16,744 | $ 19,314
Stock Appreciation Rights (SARs) |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock Options Outstanding, beginning balance, Shares | 1,060,250 | 495,000 |
Granted, Shares | 259,600 | 754,000 |
Exercised, Shares | (167,500) | (68,750) |
Forfeited, Shares | (102,500) | (120,000) |
Stock Options Outstanding, ending balance, Shares | 1,049,850 | 1,060,250 | 495,000
Exercisable, Ending Balance | 153,575 | 35,000 |
Stock Options Outstanding, beginning balance, Weighted-Average Exercise Price | $ 29.97 | $ 19.19 |
Granted, Weighted-Average Exercise Price | 43.97 | 34.70 |
Exercised, Weighted-Average Exercise Price | 23.90 | 19.10 |
Forfeited, Weighted-Average Exercise Price | 27.82 | 21.46 |
Stock Options Outstanding, ending balance, Weighted-Average Exercise Price | 34.61 | 29.97 | $ 19.19
Exercisable, Weighted Average Exercise Price | $ 38.12 | $ 19.43 |
Stock Options Outstanding, Weighted-Average Remaining Contractual Term | 5 years 5 months 16 days | 6 years 1 month 10 days |
Exercisable, Weighted-Average Remaining Contractual Term | 5 years 7 months 2 days | 5 years 6 months 11 days |
Outstanding, Aggregate Intrinsic Value | $ 13,425 | $ 9,991 |
Exercisable, Aggregate Intrinsic Value | $ 1,425 | $ 602 |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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