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Summary of Significant Accounting Policies and Recently Issued Accounting Standards - Schedule of Changes in Earnings Per Share Basic and Diluted Effect of New Accounting Adoption (Detail) - $ / shares | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | [1],[2] | Sep. 30, 2016 | [1],[2] | Jun. 30, 2016 | [1],[2] | Mar. 31, 2016 | [1],[2] | Dec. 31, 2015 | [2],[3] | Sep. 30, 2015 | [2] | Jun. 30, 2015 | [2] | Mar. 31, 2015 | [2] | Dec. 31, 2016 | Dec. 31, 2015 | [4],[5] | Dec. 31, 2014 | [4],[5]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basic EPS | $ 0.89 | $ 0.84 | $ 0.25 | $ 0.51 | $ 0.63 | $ 0.43 | $ 0.13 | $ 0.46 | $ 2.49 | [4],[5] | $ 1.63 | $ 1.22
Diluted EPS | $ 0.87 | $ 0.83 | $ 0.25 | $ 0.51 | $ 0.62 | $ 0.42 | $ 0.13 | $ 0.46 | 2.46 | [4],[5] | $ 1.62 | $ 1.20
Prior to Adoption of Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basic EPS |  |  |  |  |  |  |  |  | 2.39 |  |  |
Diluted EPS |  |  |  |  |  |  |  |  | 2.36 |  |  |
Upon Adoption of Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basic EPS |  |  |  |  |  |  |  |  | 2.49 |  |  |
Diluted EPS |  |  |  |  |  |  |  |  | $ 2.46 |  |  |
[1] | The Company early adopted ASU 2016-09 on a prospective basis, related to the recognition of excess tax benefits to the income statement which were previously recorded in additional paid-in capital, effective January 1, 2016. This resulted in an additional diluted weighted average number of common shares outstanding of 404,347, 456,352, 377,130 and 536,975 and recognition of excess tax benefits in the income tax provision of $10.6 million, zero, $1.8 million and $5.7 million for the three months ended March 31, 2016, June 30, 2016, September 30, 2016 and December 31, 2016, respectively. As a result, net earnings per common share increased by $0.05 per share, zero, $0.01 per share and $0.04 per share for three months ended March 31, 2016, June 30, 2016, September 30, 2016 and December 31, 2016, respectively. Refer to Note 2, “Recently Issued Accounting Standards” of the Notes to Consolidated Financial Statements for further details.
[2] | The sum of the quarterly per share amounts may not agree to the respective annual amounts due to rounding.
[3] | During the fourth quarter of 2015, adjustments were made to prior year provisions which resulted in an increase in earnings per share. Refer to Note 16 “Income Taxes” of the Notes to Consolidated Financial Statements for further information.
[4] | The Company early adopted ASU 2016-09 on a prospective basis as required, related to the recognition of excess tax benefits to the Consolidated Statement of Operations which were previously recorded in additional paid-in capital, effective January 1, 2016. This resulted in an additional 446,747 diluted weighted average number of common shares outstanding for the year ended December 31, 2016, and recognition of excess tax benefits of $18.1 million in the income tax provision for the year ended December 31, 2016. As a result, net earnings per common share increased by $0.10 per share for the year ended December 31, 2016. Refer to Note 2, “Summary of Significant Accounting Policies and Recently Issued Accounting Standards” of the Notes to the Consolidated Financial Statements for further details.
[5] | The Company early adopted ASU 2016-09 on a prospective basis, related to the recognition of excess tax benefits to the income statement which were previously recorded in additional paid-in capital, effective January 1, 2016. This resulted in an additional 446,747 diluted weighted average number of common shares outstanding for the year ended December 31, 2016 and recognition of excess taxbenefits of $18.1 million in income tax provision for the year ended December 31, 2016. As a result,net earnings per common share increased by $0.10 per share for the year ended December 31, 2016. Refer to Note 2, “Recently Issued Accounting Standards” of the Notes to Consolidated Financial Statements for further details.

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