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Stock-Based Compensation - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified |
12 Months Ended | ||||||||||
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Dec. 31, 2013
Tranches
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2013
First Tranche [Member]
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Dec. 31, 2013
If Granted Prior to 2013 [Member]
Second Tranche [Member]
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Dec. 31, 2013
If Granted During 2013 [Member]
Second Tranche [Member]
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Dec. 31, 2013
OHCP HM Acquisition Corp. Deferred Stock Unit Plan U.S. [Member]
Senior Officers [Member]
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Dec. 31, 2013
Employee Stock Option [Member]
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Dec. 31, 2012
Employee Stock Option [Member]
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May 28, 2010
Stock Option Plan [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||
| Common stock options granted, maximum | 49,239 | ||||||||||
| Stock options granted | 8,550 | 7,375 | 1,030 | 32,284 | |||||||
| Stock options canceled | 4,733 | ||||||||||
| Stock options exercised | 183 | ||||||||||
| Stock option liability | $ 9,618 | $ 714 | |||||||||
| Number of vesting tranches | 3 | ||||||||||
| Service-based award vests period | 5 years | 5 years | 4 years | ||||||||
| Vesting service periods for compensation costs for the portion of awards | 5 years | 5 years | 4 years | ||||||||
| Stock-based compensation expense | $ 9,006 | $ 714 | $ 0 | ||||||||
| Deferred stock unit plan, description | The DSU Plan permits an eligible executive to elect to have a short-term incentive award to be paid in the form of deferred stock units, which are bookkeeping entries equivalent in value to one share of Holdco common stock. The number of deferred stock units to be credited to a DSU Plan participant’s account is determined by dividing the amount of the participant’s short-term incentive award to be deferred into deferred stock units by the Fair Market Value (as defined in the Option Plan) of a share of common stock on December 31st of the calendar year in which occurred the end of the performance period to which the short-term incentive award applies. | ||||||||||
| Deferred stock units redeemable, description | Five year | Deferred stock units are redeemable and the value thereof payable upon the termination of employment or death of DSU Plan participant. | |||||||||
| Number of units granted | 780 | ||||||||||