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Goodwill - Additional Information (Detail) (Bachman Group Companies [Member], USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Nov. 04, 2013 | Jun. 30, 2014 | Sep. 30, 2014 | Nov. 04, 2013
Bachman Group Companies [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Voting equity interests acquired |  |  |  | 100.00%
Purchase price of cash | $ 45.8 |  |  |
Issuance of common stock | 319,953 |  |  |
Purchase price of common stock | 15 |  |  |
Date of acquisition |  |  | Nov. 04, 2013 |
Reduction in purchase price of post-closing working capital adjustments |  | 0.3 |  |
Reduction in other net assets |  | $ 0.3 |  |

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