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Stockholders' Equity - Additional Information (Detail) - USD ($) |  |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 26, 2016 | Mar. 17, 2016 | Feb. 09, 2016 | Mar. 31, 2016 | Mar. 31, 2015 | Nov. 04, 2014 | Jun. 30, 2014
Subsequent Event [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Amortization of Gains (Losses) |  |  |  | $ (400,000) |  |  |
Cash dividends declared per common share (usd per share) |  |  | $ 0.07 | $ 0.07 | $ 0.06 |  |
Payments of common stock dividends |  | $ 4,300,000 |  | $ 4,300,000 | $ 3,800,000 |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  | 16,300,000 | 3,600,000 |  |
Payments for repurchase of common stock |  |  |  | $ 16,300,000 | $ 3,600,000 |  |
April 2014 Repurchase Program [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Authorized amount |  |  |  |  |  |  | $ 15,000,000
Shares acquired |  |  |  | 1,291,974 | 233,637 |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  | $ 16,300,000 | $ 3,600,000 |  |
November 2014 Repurchase Program [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Authorized amount |  |  |  |  |  | $ 75,000,000 |
Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Cash dividends declared per common share (usd per share) | $ 0.07 |  |  |  |  |  |
Bronto [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Amortization of Gains (Losses) |  |  |  | (400,000) |  |  |
Fire Rescue |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax |  |  |  | $ 7,700,000 |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894 + Details
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